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10(5+3x)-3x=131
We move all terms to the left:
10(5+3x)-3x-(131)=0
We add all the numbers together, and all the variables
10(3x+5)-3x-131=0
We add all the numbers together, and all the variables
-3x+10(3x+5)-131=0
We multiply parentheses
-3x+30x+50-131=0
We add all the numbers together, and all the variables
27x-81=0
We move all terms containing x to the left, all other terms to the right
27x=81
x=81/27
x=3
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