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7(-4+x)=49
We move all terms to the left:
7(-4+x)-(49)=0
We add all the numbers together, and all the variables
7(x-4)-49=0
We multiply parentheses
7x-28-49=0
We add all the numbers together, and all the variables
7x-77=0
We move all terms containing x to the left, all other terms to the right
7x=77
x=77/7
x=11
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