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2x+3(5x-7)=7
We move all terms to the left:
2x+3(5x-7)-(7)=0
We multiply parentheses
2x+15x-21-7=0
We add all the numbers together, and all the variables
17x-28=0
We move all terms containing x to the left, all other terms to the right
17x=28
x=28/17
x=1+11/17
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