18x-(-3x)=105

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Solution for 18x-(-3x)=105 equation: 



18x-(-3x)=105

We move all terms to the left:

18x-(-3x)-(105)=0

We get rid of parentheses

18x+3x-105=0

We add all the numbers together, and all the variables

21x-105=0

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

21x=105

x=105/21

x=5

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