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4x+45=+21
We move all terms to the left:
4x+45-(+21)=0
We add all the numbers together, and all the variables
4x+45-21=0
We add all the numbers together, and all the variables
4x+24=0
We move all terms containing x to the left, all other terms to the right
4x=-24
x=-24/4
x=-6
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