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(-16x+13)+(-21x+23)=180
We move all terms to the left:
(-16x+13)+(-21x+23)-(180)=0
We get rid of parentheses
-16x-21x+13+23-180=0
We add all the numbers together, and all the variables
-37x-144=0
We move all terms containing x to the left, all other terms to the right
-37x=144
x=144/-37
x=-3+33/37
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