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4(x-3)=-21
We move all terms to the left:
4(x-3)-(-21)=0
We add all the numbers together, and all the variables
4(x-3)+21=0
We multiply parentheses
4x-12+21=0
We add all the numbers together, and all the variables
4x+9=0
We move all terms containing x to the left, all other terms to the right
4x=-9
x=-9/4
x=-2+1/4
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