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2(x+30)=4x
We move all terms to the left:
2(x+30)-(4x)=0
We add all the numbers together, and all the variables
-4x+2(x+30)=0
We multiply parentheses
-4x+2x+60=0
We add all the numbers together, and all the variables
-2x+60=0
We move all terms containing x to the left, all other terms to the right
-2x=-60
x=-60/-2
x=+30
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