(-3a+9b)-(-6a+7b)=-3(a-2b)

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Solution for (-3a+9b)-(-6a+7b)=-3(a-2b) equation:


Simplifying
(-3a + 9b) + -1(-6a + 7b) = -3(a + -2b)

Remove parenthesis around (-3a + 9b)
-3a + 9b + -1(-6a + 7b) = -3(a + -2b)
-3a + 9b + (-6a * -1 + 7b * -1) = -3(a + -2b)
-3a + 9b + (6a + -7b) = -3(a + -2b)

Reorder the terms:
-3a + 6a + 9b + -7b = -3(a + -2b)

Combine like terms: -3a + 6a = 3a
3a + 9b + -7b = -3(a + -2b)

Combine like terms: 9b + -7b = 2b
3a + 2b = -3(a + -2b)
3a + 2b = (a * -3 + -2b * -3)
3a + 2b = (-3a + 6b)

Solving
3a + 2b = -3a + 6b

Solving for variable 'a'.

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

Add '3a' to each side of the equation.
3a + 3a + 2b = -3a + 3a + 6b

Combine like terms: 3a + 3a = 6a
6a + 2b = -3a + 3a + 6b

Combine like terms: -3a + 3a = 0
6a + 2b = 0 + 6b
6a + 2b = 6b

Add '-2b' to each side of the equation.
6a + 2b + -2b = 6b + -2b

Combine like terms: 2b + -2b = 0
6a + 0 = 6b + -2b
6a = 6b + -2b

Combine like terms: 6b + -2b = 4b
6a = 4b

Divide each side by '6'.
a = 0.6666666667b

Simplifying
a = 0.6666666667b

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