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

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


Simplifying
9 + -3(a + b) = 7 + a
9 + (a * -3 + b * -3) = 7 + a
9 + (-3a + -3b) = 7 + a

Solving
9 + -3a + -3b = 7 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
9 + -3a + -1a + -3b = 7 + a + -1a

Combine like terms: -3a + -1a = -4a
9 + -4a + -3b = 7 + a + -1a

Combine like terms: a + -1a = 0
9 + -4a + -3b = 7 + 0
9 + -4a + -3b = 7

Add '-9' to each side of the equation.
9 + -4a + -9 + -3b = 7 + -9

Reorder the terms:
9 + -9 + -4a + -3b = 7 + -9

Combine like terms: 9 + -9 = 0
0 + -4a + -3b = 7 + -9
-4a + -3b = 7 + -9

Combine like terms: 7 + -9 = -2
-4a + -3b = -2

Add '3b' to each side of the equation.
-4a + -3b + 3b = -2 + 3b

Combine like terms: -3b + 3b = 0
-4a + 0 = -2 + 3b
-4a = -2 + 3b

Divide each side by '-4'.
a = 0.5 + -0.75b

Simplifying
a = 0.5 + -0.75b

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