2(x-7.5)=1.5x

问题描述:

2(x-7.5)=1.5x

2X-2×7.5=1.5x
2x-1.5x=2×7.5
0.5x=2×7.5
x=2×7.5÷0.5
x=30

two times negative seven point five equal to one point five x

2(x-7.5)=1.5x
2x-2x7.5=1.5x
2x-15=1.5x
2x-1.5x=15
0.5x=15
x=30
注意:第二行是2乘7.5,不是x