rozwiąż równania x+2x=x+9 y+2y-5=11-y 3a+4=a-1+a+7 10-2b+6-b=10-b+4-b

x+2x=x+9 3x-x=9 2x=9 x = 4 i1/2 y+2y-5=11-y 3y+y=11+5 4y=16 / :4 y=4 3a+4=a-1+a+7 3a-a-a=-1+7-4 a=2 10-2b+6-b=10-b+4-b -2b-b+b+b=10+4-6-10 -b=-2 / : - 1 b=2

x+2x=x+9 3x=x+9 3x - x = 9 2x = 9 x = 4.5 y+2y-5=11-y 3y - 5 = 11 - y 3 y + y = 11 + 5 4 y = 16 y = 4 3a+4=a-1+a+7 3a+4=2a + 6 a = 6-4 a = 2 10-2b+6-b=10-b+4-b -2b-b+b+b=10+4-10-6 -b=-2 b=2

x + 2x = x + 9 3x = x +9 2x = 9 | :2 x = 4,5 y + 2y - 5 = 11 - y 3y - 5 = 11 - y 3y - y = 11 +5 2y = 16 | :2 y = 8 3a + 4 = a - 1 + a +7 3a - a - a = 1 + 7 - 4 a = 4 10 - 2b + 6 - b = 10 - b + 4 - b 4 - 2b - b =10 - b + 4 - b 4 - b = 10 - b + 4 -b 4 - b = 6 - b - b - b + b - b = 6 - 4 b = 2