a-(-15)=4a-3

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Solution for a-(-15)=4a-3 equation: 



a-(-15)=4a-3

We move all terms to the left:

a-(-15)-(4a-3)=0

We add all the numbers together, and all the variables

a-(4a-3)+15=0

We get rid of parentheses

a-4a+3+15=0

We add all the numbers together, and all the variables

-3a+18=0

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

-3a=-18

a=-18/-3

a=+6

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