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7x-5(2x-15)=42
We move all terms to the left:
7x-5(2x-15)-(42)=0
We multiply parentheses
7x-10x+75-42=0
We add all the numbers together, and all the variables
-3x+33=0
We move all terms containing x to the left, all other terms to the right
-3x=-33
x=-33/-3
x=+11
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