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2x+3(x-7)=4=x=
We move all terms to the left:
2x+3(x-7)-(4)=0
We multiply parentheses
2x+3x-21-4=0
We add all the numbers together, and all the variables
5x-25=0
We move all terms containing x to the left, all other terms to the right
5x=25
x=25/5
x=5
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