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(10x-1)+61=90
We move all terms to the left:
(10x-1)+61-(90)=0
We add all the numbers together, and all the variables
(10x-1)-29=0
We get rid of parentheses
10x-1-29=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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