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20(x+2)=5x+10=4(5x+10)+31
We move all terms to the left:
20(x+2)-(5x+10)=0
We multiply parentheses
20x-(5x+10)+40=0
We get rid of parentheses
20x-5x-10+40=0
We add all the numbers together, and all the variables
15x+30=0
We move all terms containing x to the left, all other terms to the right
15x=-30
x=-30/15
x=-2
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