131-x=3x+7

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Solution for 131-x=3x+7 equation: 



131-x=3x+7

We move all terms to the left:

131-x-(3x+7)=0

We add all the numbers together, and all the variables

-1x-(3x+7)+131=0

We get rid of parentheses

-1x-3x-7+131=0

We add all the numbers together, and all the variables

-4x+124=0

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

-4x=-124

x=-124/-4

x=+31

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