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10x-20-7x=1*
We move all terms to the left:
10x-20-7x-(1*)=0
We add all the numbers together, and all the variables
10x-7x-20-0=0
We add all the numbers together, and all the variables
3x-20=0
We move all terms containing x to the left, all other terms to the right
3x=20
x=20/3
x=6+2/3
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