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10+7x+3x=+20
We move all terms to the left:
10+7x+3x-(+20)=0
We add all the numbers together, and all the variables
7x+3x+10-20=0
We add all the numbers together, and all the variables
10x-10=0
We move all terms containing x to the left, all other terms to the right
10x=10
x=10/10
x=1
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