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4x+18=3-x
We move all terms to the left:
4x+18-(3-x)=0
We add all the numbers together, and all the variables
4x-(-1x+3)+18=0
We get rid of parentheses
4x+1x-3+18=0
We add all the numbers together, and all the variables
5x+15=0
We move all terms containing x to the left, all other terms to the right
5x=-15
x=-15/5
x=-3
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