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10x+21=31*
We move all terms to the left:
10x+21-(31*)=0
We add all the numbers together, and all the variables
10x+21-0=0
We add all the numbers together, and all the variables
10x+21=0
We move all terms containing x to the left, all other terms to the right
10x=-21
x=-21/10
x=-2+1/10
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