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

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



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

We move all terms to the left:

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

We get rid of parentheses

3x+x-15+5-90=0

We add all the numbers together, and all the variables

4x-100=0

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

4x=100

x=100/4

x=25

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