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3x+16=6(7)+12
We move all terms to the left:
3x+16-(6(7)+12)=0
We add all the numbers together, and all the variables
3x+16-79=0
We add all the numbers together, and all the variables
3x-63=0
We move all terms containing x to the left, all other terms to the right
3x=63
x=63/3
x=21
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