Question

（x+1.2)x4=13.2 0.7x+3x1.4=11.2

Answer 1

（x+1.2)x4=13.2

4x+4.8=13.2

4x=13.2-4.8

4x=8.4

x=2.1

0.7x+3x1.4=11.2

0.7x+4.2=11.2

0.7x=11.2-4.2

0.7x=7

x=10