How do you know if the linear term will be a plus or a minus ?

I think these links will help you out here: (I read through and watch both)

https://www.purplemath.com/modules/factquad.htm

https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:forms-of-linear-equations/x2f8bb11595b61c86:standard-form/v/standard-form-rules

Step-by-step explanation:

Hope that this helps! :)

Have a great rest of your day/night!

step-by-step explanation:

ddd

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116