(1.8+у)·7=-22.4, (2+ ×)·3·1=12.4,(1.2+ ×)·(-5)=4

Question

(1.8+у)·7=-22.4, (2+ ×)·3·1=12.4,(1.2+ ×)·(-5)=4

Answer 1

1) 12,6+7y=-22,4
    12,6+22,4=-7y
    35=-7y
    y=-5
2)6+3x=12,4
  3x=12,4
  3x=6,4
  x=64/30
3)-6-5x=4
  -5x=10
  x=-2