15x+3(5x+10)=90

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Solution for 15x+3(5x+10)=90 equation: 



15x+3(5x+10)=90

We move all terms to the left:

15x+3(5x+10)-(90)=0

We multiply parentheses

15x+15x+30-90=0

We add all the numbers together, and all the variables

30x-60=0

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

30x=60

x=60/30

x=2

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