3a+18+-5a=2(a+7)+-12

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Solution for 3a+18+-5a=2(a+7)+-12 equation: 



3a+18+-5a=2(a+7)+-12

We move all terms to the left:

3a+18+-5a-(2(a+7)+-12)=0

We add all the numbers together, and all the variables

-2a-(2(a+7)+-12)=0

We use the square of the difference formula

-2a-(2(a+7)-12)=0



We calculate terms in parentheses: -(2(a+7)-12), so:

2(a+7)-12

We multiply parentheses

2a+14-12

We add all the numbers together, and all the variables

2a+2

Back to the equation:

-(2a+2)



We get rid of parentheses

-2a-2a-2=0

We add all the numbers together, and all the variables

-4a-2=0

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

-4a=2

a=2/-4

a=-1/2

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