235 чётныесрочно плиз

2. 1.6*(7х-2) = 4*10.4 11.2х - 3.2 = 41.6 11.2х = 41.6 + 3.2 11.2х = 44.8 х = 44.8 :11.2 х = 4 4. 3.6 * (3х+0.8) = 4.8*9.6 10.8х + 2.88 = 46.08 10.8х = 46.08 - 2.88 10.8х = 43.2 х = 43.2 : 10.8 х = 4 6. 8 * (9х+7) = 28*20 72х + 56 = 560 72х = 560 -56 72х = 504 х = 504:72 х = 7