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(7x+9)+(9x+5)=180
We move all terms to the left:
(7x+9)+(9x+5)-(180)=0
We get rid of parentheses
7x+9x+9+5-180=0
We add all the numbers together, and all the variables
16x-166=0
We move all terms containing x to the left, all other terms to the right
16x=166
x=166/16
x=10+3/8
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