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3x+7x=6+24
We move all terms to the left:
3x+7x-(6+24)=0
We add all the numbers together, and all the variables
3x+7x-30=0
We add all the numbers together, and all the variables
10x-30=0
We move all terms containing x to the left, all other terms to the right
10x=30
x=30/10
x=3
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