Д)5-х=4(х-3) ж)7-(2х+3)=9 е)5(х+4)+х=6

5-x=4x-12 4x+x=5+12 5x=17 x=17:5 x=3,4 ========== 7-2x-3=9 4-2x=9 -2x=9-4 -2x=5 x=5:(-2) x=-2,5 ========= 5x+20+x=6 6x+20=6 6x=6-20 6x=-14 x=-14:6 x=-2 1/3

д)5-х=4x-12 -x-4x=-12-5 -5x=-17 x=-17/-5 x=3.4 ж)7-(2х+3)=9 7-2х-3=9 4-2х=9 -2х=9-4 -2х=5 х=-2,5