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7x+3(-3x+7)=11
We move all terms to the left:
7x+3(-3x+7)-(11)=0
We multiply parentheses
7x-9x+21-11=0
We add all the numbers together, and all the variables
-2x+10=0
We move all terms containing x to the left, all other terms to the right
-2x=-10
x=-10/-2
x=+5
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