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4x+36=6x-21
We move all terms to the left:
4x+36-(6x-21)=0
We get rid of parentheses
4x-6x+21+36=0
We add all the numbers together, and all the variables
-2x+57=0
We move all terms containing x to the left, all other terms to the right
-2x=-57
x=-57/-2
x=28+1/2
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