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4(x+3)+3=7x+12
We move all terms to the left:
4(x+3)+3-(7x+12)=0
We multiply parentheses
4x-(7x+12)+12+3=0
We get rid of parentheses
4x-7x-12+12+3=0
We add all the numbers together, and all the variables
-3x+3=0
We move all terms containing x to the left, all other terms to the right
-3x=-3
x=-3/-3
x=1
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