-a+b=a-3b

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Solution for -a+b=a-3b equation:


Simplifying
-1a + b = a + -3b

Solving
-1a + b = a + -3b

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.
-1a + -1a + b = a + -1a + -3b

Combine like terms: -1a + -1a = -2a
-2a + b = a + -1a + -3b

Combine like terms: a + -1a = 0
-2a + b = 0 + -3b
-2a + b = -3b

Add '-1b' to each side of the equation.
-2a + b + -1b = -3b + -1b

Combine like terms: b + -1b = 0
-2a + 0 = -3b + -1b
-2a = -3b + -1b

Combine like terms: -3b + -1b = -4b
-2a = -4b

Divide each side by '-2'.
a = 2b

Simplifying
a = 2b

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