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131=56+3x
We move all terms to the left:
131-(56+3x)=0
We add all the numbers together, and all the variables
-(3x+56)+131=0
We get rid of parentheses
-3x-56+131=0
We add all the numbers together, and all the variables
-3x+75=0
We move all terms containing x to the left, all other terms to the right
-3x=-75
x=-75/-3
x=+25
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