12x-25+7x+40=90

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Solution for 12x-25+7x+40=90 equation: 



12x-25+7x+40=90

We move all terms to the left:

12x-25+7x+40-(90)=0

We add all the numbers together, and all the variables

19x-75=0

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

19x=75

x=75/19

x=3+18/19

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