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-47-12x=43-9x
We move all terms to the left:
-47-12x-(43-9x)=0
We add all the numbers together, and all the variables
-12x-(-9x+43)-47=0
We get rid of parentheses
-12x+9x-43-47=0
We add all the numbers together, and all the variables
-3x-90=0
We move all terms containing x to the left, all other terms to the right
-3x=90
x=90/-3
x=-30
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