x=3.5
解方程如下:3(x-1.5)=63X-4.5=63X=6+4.53X=10.5X=3.5
x-1.5=6÷3=2x=2+1.5x=3.5
x-1.5=6÷3X-1.5=2X=2+1.5X=3.5
3(x-1.5)=6x-1.5=2x=3.5