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(2x+4)+(5x-2)=79
We move all terms to the left:
(2x+4)+(5x-2)-(79)=0
We get rid of parentheses
2x+5x+4-2-79=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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