5x-15+2x-42=90

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Solution for 5x-15+2x-42=90 equation: 



5x-15+2x-42=90

We move all terms to the left:

5x-15+2x-42-(90)=0

We add all the numbers together, and all the variables

7x-147=0

We move all terms containing x to the left, all other terms to the right

7x=147

x=147/7

x=21

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