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You made a mistake in your subtracting.

-3y [12 18] [12 18] [27 -18] [12 18]

[-24 30] -[-24 30] = [30 6] - [-24 30]

-3y = [15 -36]

[54 -24]

-3y/-3 = [15/-3 -36/-3]

[54/-3 -24/-3]

y = [-5 12]

[-18 8]

Algebra

Answers by Expert:

Any algebraic question you've got. That includes question that are linear, quadratic, exponential, etc.

I have solved story problems, linear equations, parabolic equations.
I have also solved some 3rd order equations and equations with multiple variables.
**Publications**

Documents at Boeing in assistance on the manufacturiing floor.**Education/Credentials**

MS at math OSU in mathematics at OSU, 1986.
BS at OSU in mathematical sciences (math, statistics, computer science), 1984.
**Awards and Honors**

Both my BS and MS degrees were given with honors.
**Past/Present Clients**

Students in a wide variety of areas since the 80's; over 1,000 of them have been in algebra.