4.5x+3x=90

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Solution for 4.5x+3x=90 equation: 



4.5x+3x=90

We move all terms to the left:

4.5x+3x-(90)=0

We add all the numbers together, and all the variables

7.5x-90=0

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

7.5x=90

x=90/7.5

x=12

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