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(x+40)+(3x+40)=10x+30
We move all terms to the left:
(x+40)+(3x+40)-(10x+30)=0
We get rid of parentheses
x+3x-10x+40+40-30=0
We add all the numbers together, and all the variables
-6x+50=0
We move all terms containing x to the left, all other terms to the right
-6x=-50
x=-50/-6
x=8+1/3
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