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4=3x+15
We move all terms to the left:
4-(3x+15)=0
We get rid of parentheses
-3x-15+4=0
We add all the numbers together, and all the variables
-3x-11=0
We move all terms containing x to the left, all other terms to the right
-3x=11
x=11/-3
x=-3+2/3
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