x-20+x+x+40=310

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Solution for x-20+x+x+40=310 equation: 



x-20+x+x+40=310

We move all terms to the left:

x-20+x+x+40-(310)=0

We add all the numbers together, and all the variables

3x-290=0

We move all terms containing x to the left, all other terms to the right

3x=290

x=290/3

x=96+2/3

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