x-3.5+3.5=5.2+3.5 x=8.7 验算:左边=8.7-3.5=5.2=右边.
解:x−3.5+3.5=5.2+3.5 X=8.7 验算X=8.7方程左边=x−3.5 =8.7-3.5 =方程右边