(7a-12b+4c)-(-8a+15b-9c)=

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Solution for (7a-12b+4c)-(-8a+15b-9c)= equation:


Simplifying
(7a + -12b + 4c) + -1(-8a + 15b + -9c) = 0

Remove parenthesis around (7a + -12b + 4c)
7a + -12b + 4c + -1(-8a + 15b + -9c) = 0
7a + -12b + 4c + (-8a * -1 + 15b * -1 + -9c * -1) = 0
7a + -12b + 4c + (8a + -15b + 9c) = 0

Reorder the terms:
7a + 8a + -12b + -15b + 4c + 9c = 0

Combine like terms: 7a + 8a = 15a
15a + -12b + -15b + 4c + 9c = 0

Combine like terms: -12b + -15b = -27b
15a + -27b + 4c + 9c = 0

Combine like terms: 4c + 9c = 13c
15a + -27b + 13c = 0

Solving
15a + -27b + 13c = 0

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '27b' to each side of the equation.
15a + -27b + 27b + 13c = 0 + 27b

Combine like terms: -27b + 27b = 0
15a + 0 + 13c = 0 + 27b
15a + 13c = 0 + 27b
Remove the zero:
15a + 13c = 27b

Add '-13c' to each side of the equation.
15a + 13c + -13c = 27b + -13c

Combine like terms: 13c + -13c = 0
15a + 0 = 27b + -13c
15a = 27b + -13c

Divide each side by '15'.
a = 1.8b + -0.8666666667c

Simplifying
a = 1.8b + -0.8666666667c

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