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-42-9x=-3x+48
We move all terms to the left:
-42-9x-(-3x+48)=0
We get rid of parentheses
-9x+3x-48-42=0
We add all the numbers together, and all the variables
-6x-90=0
We move all terms containing x to the left, all other terms to the right
-6x=90
x=90/-6
x=-15
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