Question

7x÷15=2.13x-2(10-x)=152x-1.8=x+2.40.72×3+4x=3.06+3x7.8x-4x=2

Answer 1

①7x÷15=2.1

7x=2.1+15

7x=17.1

x=171/70

②3x-2(10-x)=15

3x-20+2x=15

5 x=15+20

x=7

③2x-1.8=x+2.4

2x-x=2.4+1.8

x=4.2

④0.72×3+4x=3.06+3x

2.15+4x=3.06+3x

x=3.06-2.15

x=0.91

⑤7.8x-4x=2x+3.6

1.8x=3.6

x=2

⑥3y+2+y-1+6y=10y+1