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4x+141=9x-9
We move all terms to the left:
4x+141-(9x-9)=0
We get rid of parentheses
4x-9x+9+141=0
We add all the numbers together, and all the variables
-5x+150=0
We move all terms containing x to the left, all other terms to the right
-5x=-150
x=-150/-5
x=+30
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