(3a+b)-(-9a+4b)=

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Solution for (3a+b)-(-9a+4b)= equation:


Simplifying
(3a + b) + -1(-9a + 4b) = 0

Remove parenthesis around (3a + b)
3a + b + -1(-9a + 4b) = 0
3a + b + (-9a * -1 + 4b * -1) = 0
3a + b + (9a + -4b) = 0

Reorder the terms:
3a + 9a + b + -4b = 0

Combine like terms: 3a + 9a = 12a
12a + b + -4b = 0

Combine like terms: b + -4b = -3b
12a + -3b = 0

Solving
12a + -3b = 0

Solving for variable 'a'.

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

Add '3b' to each side of the equation.
12a + -3b + 3b = 0 + 3b

Combine like terms: -3b + 3b = 0
12a + 0 = 0 + 3b
12a = 0 + 3b
Remove the zero:
12a = 3b

Divide each side by '12'.
a = 0.25b

Simplifying
a = 0.25b

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