6.3+87x=4.5移项87x=4.5-6.387x=-1.8系数化1x=48.3
6.3+87x=4.587x=4.5-6.387x=-1.8x=-1.8÷87x=-0.0206
6.3+87x=4.5解:87x=4.5-6.3x=-1.8÷87x=-6/290
解:6.3+87X=4.587X=4.5-6.387X=-1.8X=-18/870X=-9/435X=-3/145