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16x+123=10x+81
We move all terms to the left:
16x+123-(10x+81)=0
We get rid of parentheses
16x-10x-81+123=0
We add all the numbers together, and all the variables
6x+42=0
We move all terms containing x to the left, all other terms to the right
6x=-42
x=-42/6
x=-7
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