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(-2)(x+3)=42
We move all terms to the left:
(-2)(x+3)-(42)=0
We multiply parentheses ..
(-2x-6)-42=0
We get rid of parentheses
-2x-6-42=0
We add all the numbers together, and all the variables
-2x-48=0
We move all terms containing x to the left, all other terms to the right
-2x=48
x=48/-2
x=-24
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