15+3x=105

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Solution for 15+3x=105 equation: 



15+3x=105

We move all terms to the left:

15+3x-(105)=0

We add all the numbers together, and all the variables

3x-90=0

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

3x=90

x=90/3

x=30

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