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4x+70=11x+21
We move all terms to the left:
4x+70-(11x+21)=0
We get rid of parentheses
4x-11x-21+70=0
We add all the numbers together, and all the variables
-7x+49=0
We move all terms containing x to the left, all other terms to the right
-7x=-49
x=-49/-7
x=+7
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