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17x-19=10x+30=90
We move all terms to the left:
17x-19-(10x+30)=0
We get rid of parentheses
17x-10x-30-19=0
We add all the numbers together, and all the variables
7x-49=0
We move all terms containing x to the left, all other terms to the right
7x=49
x=49/7
x=7
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