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(3x-10)+(4x-5)=90
We move all terms to the left:
(3x-10)+(4x-5)-(90)=0
We get rid of parentheses
3x+4x-10-5-90=0
We add all the numbers together, and all the variables
7x-105=0
We move all terms containing x to the left, all other terms to the right
7x=105
x=105/7
x=15
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