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2x+3(5x-1)=99
We move all terms to the left:
2x+3(5x-1)-(99)=0
We multiply parentheses
2x+15x-3-99=0
We add all the numbers together, and all the variables
17x-102=0
We move all terms containing x to the left, all other terms to the right
17x=102
x=102/17
x=6
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