解方程x+35=70 x-6.1=6.1 2.3+x=12 5x=3

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x+35=70
x=70-35
x=35

x-6.1=6.1
x=6.1+61
x=12.2

2.3+x=12
x=12-2.3
x=9.7

5x=3
x=3/5

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