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-45x-13=(77+90)
We move all terms to the left:
-45x-13-((77+90))=0
We add all the numbers together, and all the variables
-45x-13-(167)=0
We add all the numbers together, and all the variables
-45x-180=0
We move all terms containing x to the left, all other terms to the right
-45x=180
x=180/-45
x=-4
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