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(3x+4)+(5x-10)=45
We move all terms to the left:
(3x+4)+(5x-10)-(45)=0
We get rid of parentheses
3x+5x+4-10-45=0
We add all the numbers together, and all the variables
8x-51=0
We move all terms containing x to the left, all other terms to the right
8x=51
x=51/8
x=6+3/8
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