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(5x-7)+(4x)=180
We move all terms to the left:
(5x-7)+(4x)-(180)=0
We add all the numbers together, and all the variables
4x+(5x-7)-180=0
We get rid of parentheses
4x+5x-7-180=0
We add all the numbers together, and all the variables
9x-187=0
We move all terms containing x to the left, all other terms to the right
9x=187
x=187/9
x=20+7/9
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