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2x+13=90-47
We move all terms to the left:
2x+13-(90-47)=0
We add all the numbers together, and all the variables
2x+13-43=0
We add all the numbers together, and all the variables
2x-30=0
We move all terms containing x to the left, all other terms to the right
2x=30
x=30/2
x=15
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