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5x-2(7x+3)=75
We move all terms to the left:
5x-2(7x+3)-(75)=0
We multiply parentheses
5x-14x-6-75=0
We add all the numbers together, and all the variables
-9x-81=0
We move all terms containing x to the left, all other terms to the right
-9x=81
x=81/-9
x=-9
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