a)2x+6=20 2x=20-6 2x=14 :2 x=7 b) -4c-46=-2 -4c=-2+46 -4c=44 : -4 c=-11 c) 7x-21=5x 7x-5x=21 2x=21 :2 x=10,5 d) 3c+2=-70 3c=-70-2 3c=-72 :3 c= -24 e) 23+9y=50 9y=27 :9 y=3 f) 13+2x=3 2x=-10 :2 x=-5 g) 6y-13=-52 6y=-39 :6 y=-6,5 h) 33-4x=4x -8x=-33 :-8 x=4,13 i) 8y-36=24 8y=60 :8 y=7,5 j) -7=5x+1 -5x=8 :-5 x=1,6 k) 4x-4=3 4x=7 :4 x=1,75 j) 5-10x=-2x -8x=-5 :-8 x=0,62
2x+6=20 2x=20-6 2x=14/:2 x=7 -4c-46=-2 -4c=-2+46 -4c=44/:(-4) c=11 7x-21=5x -21=5x-7x -21=-2x/:(-2) x=10.5 3c+2=-70 3c=-70-2 3c=-72/:3 c=-24 23+9y=50 9y=50-23 9y=27/:9 y=3 13+2x=3 2x=3-13 2x=-10/:2 x=-5 6y-13=-52 6y=-52+13 6y=-39/:6 y= -6.5 33-4x=4x 33=4x+4x 33=8x/:8 x=4.12 8y-36=24 8y=24+36 8y=60 y=7.5 -7=5x+1 -7-1=5x -8=5x/:5 x=-1.6 4x-4=3 4x=3+4 4x=7/:4 x:1.75 5-10x=-2x 5=-2x+10x 5=8x/:8 x=0.625
2x+6=20 |-6 2x=14 |:2 x=7 L= 2*7+6=14+6=20 p= 20 L=P -4c-46=-2 |+46 -4C=44 |:(-4) C= (-11) L= (-4)*(-11)-46= 44-46 = -2 P= -2 L=P 7x-21=5x |-7x -21= -2x |:(-2) 10,5=x L= 7*10,5 - 21 = 73,5 -21= 52,5 P= 5*10,5 = 52,5 L=P 3c+2=-70 |-2 3c = -72 c=-24 L= 3*(-24)+2 =-72+2=70 P= 70 23+9y=50 |-23 9y=27 |:9 y=3 13+2x=3 |-13 2x=-10 |:2 x=-5 6y-13=-52 |+13 6y=-39 |:6 y = 6,5 33-4x=4x |+4x 33=8x |:8 4,125=x 8y-36=24|+36 8y = 60 |:8 y=7,5 -7=5x+1 |-1 -8 = 5x |:5 -1,6=y 4x-4=3 |+4 4x=7 |4 x=1,75 5-10x=-2x |+10x 5=8x |:8 0,625=x
