POMOCY !!! zadanie 11 Daje Naj pliss proszę o obliczenia

a) 8x + 5 = 7x | - 5 8x = 7x - 5 | - 7x 8x - 7x = -5 x = -5 Sprawdzenie: L = 8 · (-5) + 5 = -40 + 5 = -35 P = 7 · (-5) = -35 L = P b) 7n + 2 = 6n - 3 | - 2 7n = 6n - 3 - 2 7n = 6n - 5 | - 6n 7n - 6n = -5 n = -5 Sprawdzenie: L = 7 · (-5) + 2 = -35 + 2 = -33 P = 6 · (-5) - 3 = -30 - 3 = -33 L = P c) -x + 25 = 2x - 2 | + 2 -x + 25 + 2 = 2x -x + 27 = 2x | + x 27 = 2x + x 27 = 3x |: 3 9 = x x = 9 Sprawdzenie: L = -9 + 25 = 16 P = 2 · 9 - 2 = 18 - 2 = 16 L = P d) -9z - 7 = -z - 6 | + 6 -9z - 7 + 6 = -z -9z - 1 = -z | + 9z -1 = -z + 9z -1 = 8z |: 8 -  = z z = -  Sprawdzenie: L = -9 · (-) - 7 =  - 7 = 1 - 7 = -5 P = - (-) - 6 =  - 6 = -5 L = P e) 25m - 3 = 24m - 4 | + 3 25m = 24m - 4 + 3 25m = 24m - 1 | - 24m 25m - 24m = -1 m = -1 Sprawdzenie: L = 25 ·  (-1) - 3 = -25 - 3 = -28 P = 24 · (-1) - 4 = -24 - 4 = -28 L = P f) -s + 15 = 4s - 14 | + 14 -s + 15 + 14 = 4s -s + 29 = 4s | + s 29 = 4s + s 29 = 5s |:5  = s s = 5 Sprawdzenie:  L = -5 + 15 = 9 P = 4 ·   - 14 =  - 14 = 23  - 14 = 9 L = P g) 17y + 28 = 19y + 27 | - 27 17y + 28 - 27 = 19y 17y + 1 = 19y | - 17y 1 = 19y - 17y 1 =2y |: 2  = y Sprawdzenie: L = 17 ·  + 28 =  + 28 = 8 + 28 = 36 P= 19 ·  + 27 =  + 27 = 9 + 27 = 36 L = P h)  8k - 19 = -8k + 19 | + 19 8k = -8k + 19 + 19 8k = -8k + 38 | + 8k 8k + 8k = 68 16k = 38 |: 16 k =  k =  Sprawdzenie: L = 8 ·  - 19 = 19 - 19 = 0 P = -8 ·  + 19 = -19 + 19 = 0 L = P