解方程 :18+0.4x=22.2-x

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解方程 :18+0.4x=22.2-x

0.4x+x=22.2-18
1.4x=4.2
x=3

18+0.4x=22.2-x
0.4x+x=22.2-18
1.4x=4.2
x=3

3

解 :18+0.4x=22.2-x
0.4x+x=22.2-18
1.4x=4.2
x=3

18+0.4x=22.2-x
1.4x=4.2
x=3

18+0.4x=22.2-x两边乘以5
90+2x=111-5x
7x=21
x=3