2x+7=5x+13;
2х-5х=13-7
-3х=6
х=-2
6-7x=7-8x .
6-7=-8х+7х
-1=-х
х=1
6-7x=7-8x -7x+8x=7-6 x=1 2x+7=5x+13 2x-5x=13-7 -3x=6 x=-2 8+32y=10+31y 32y-31y=10-8 x=2