X+105=3x+15

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Solution for X+105=3x+15 equation: 



X+105=3X+15

We move all terms to the left:

X+105-(3X+15)=0

We get rid of parentheses

X-3X-15+105=0

We add all the numbers together, and all the variables

-2X+90=0

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

-2X=-90

X=-90/-2

X=+45

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