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10x-9+19x-18+7x+1=90
We move all terms to the left:
10x-9+19x-18+7x+1-(90)=0
We add all the numbers together, and all the variables
36x-116=0
We move all terms containing x to the left, all other terms to the right
36x=116
x=116/36
x=3+2/9
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