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5(x+20)=10x+30
We move all terms to the left:
5(x+20)-(10x+30)=0
We multiply parentheses
5x-(10x+30)+100=0
We get rid of parentheses
5x-10x-30+100=0
We add all the numbers together, and all the variables
-5x+70=0
We move all terms containing x to the left, all other terms to the right
-5x=-70
x=-70/-5
x=+14
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