x÷5+×÷2=2.1×+0.7

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x÷5+×÷2=2.1×+0.7x÷5+×÷2=2.1×+0.7x÷5+×÷2=2.1×+0.7都化为小数0.2x+0.5x=2.1x+0.7(2.1-0.5-0.2)x=-0.71.4x=-0.7x

x÷5+×÷2=2.1×+0.7
x÷5+×÷2=2.1×+0.7

x÷5+×÷2=2.1×+0.7
都化为小数
0.2x+0.5x=2.1x+0.7
(2.1-0.5-0.2)x=-0.7
1.4x=-0.7
x=-0.5
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