4x-21+7x-18=90

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Solution for 4x-21+7x-18=90 equation: 



4x-21+7x-18=90

We move all terms to the left:

4x-21+7x-18-(90)=0

We add all the numbers together, and all the variables

11x-129=0

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

11x=129

x=129/11

x=11+8/11

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