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

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


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

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

Multiply -1 * -2
3b + 2a + 9 = 7

Reorder the terms:
9 + 2a + 3b = 7

Solving
9 + 2a + 3b = 7

Solving for variable 'a'.

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

Add '-9' to each side of the equation.
9 + 2a + -9 + 3b = 7 + -9

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

Combine like terms: 9 + -9 = 0
0 + 2a + 3b = 7 + -9
2a + 3b = 7 + -9

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

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

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

Divide each side by '2'.
a = -1 + -1.5b

Simplifying
a = -1 + -1.5b

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