12+-3(x+-5)=21

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Solution for 12+-3(x+-5)=21 equation: 



12+-3(x+-5)=21

We move all terms to the left:

12+-3(x+-5)-(21)=0

determiningTheFunctionDomain
-3(x+-5)+12-21+=0

We add all the numbers together, and all the variables

-3(x-5)+12-21+=0

We add all the numbers together, and all the variables

-3(x-5)=0

We multiply parentheses

-3x+15=0

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

-3x=-15

x=-15/-3

x=+5

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