2(x-2)-1=5(x-2)-7 Решите уравнение
2х-4-1=5х-10-7 2х-5х=4+1-10-7 -3х=-12 х=4
2(x-2)-1=5(x-2)-7 2x-4-1=5x-10-7 2x-5=5x-17 /+17 2x-5+17=5x-17+17 2x+12=5x /-2x 2x-2x+12=5x-2x 12=3x /:3 4=x x=4 -----