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(x+97)+(x+89)=12
We move all terms to the left:
(x+97)+(x+89)-(12)=0
We get rid of parentheses
x+x+97+89-12=0
We add all the numbers together, and all the variables
2x+174=0
We move all terms containing x to the left, all other terms to the right
2x=-174
x=-174/2
x=-87
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