1x+7x+4x=90

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Solution for 1x+7x+4x=90 equation: 



1x+7x+4x=90

We move all terms to the left:

1x+7x+4x-(90)=0

We add all the numbers together, and all the variables

12x-90=0

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

12x=90

x=90/12

x=7+1/2

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