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9(-3x-10)=42
We move all terms to the left:
9(-3x-10)-(42)=0
We multiply parentheses
-27x-90-42=0
We add all the numbers together, and all the variables
-27x-132=0
We move all terms containing x to the left, all other terms to the right
-27x=132
x=132/-27
x=-4+8/9
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