2x+1+3(x-2)=14; -5(7-x)-4(x-8)=3.
2х + 1 +3(х - 2)= 14 -5(7-х) -4(х-8)=3 2х +1 + 3х - 6 = 14 -35+5х - 4х +32 =3 5х = 14 -1 +6 х = 3 + 35 - 32 5х = 19 х= 6 х= 19:5 х= 3,8