2(3x - 7) + 4(3x + 2) = 6(5x + 9)
6х-14+12х+8=30х+54 6х+12х-30х=54+14-8 -12х=60 х=-5
2(3х-7)+4(3х+2)=6(5х+9) 6х-14+12х+8=30х+54; 18х-6=30х+54; 18х-30х=54+6; -12х=60; х= -5; Ответ : -5.