3a+b-20=a-4b+42

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Solution for 3a+b-20=a-4b+42 equation:


Simplifying
3a + b + -20 = a + -4b + 42

Reorder the terms:
-20 + 3a + b = a + -4b + 42

Reorder the terms:
-20 + 3a + b = 42 + a + -4b

Solving
-20 + 3a + b = 42 + a + -4b

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.
-20 + 3a + -1a + b = 42 + a + -1a + -4b

Combine like terms: 3a + -1a = 2a
-20 + 2a + b = 42 + a + -1a + -4b

Combine like terms: a + -1a = 0
-20 + 2a + b = 42 + 0 + -4b
-20 + 2a + b = 42 + -4b

Add '20' to each side of the equation.
-20 + 2a + 20 + b = 42 + 20 + -4b

Reorder the terms:
-20 + 20 + 2a + b = 42 + 20 + -4b

Combine like terms: -20 + 20 = 0
0 + 2a + b = 42 + 20 + -4b
2a + b = 42 + 20 + -4b

Combine like terms: 42 + 20 = 62
2a + b = 62 + -4b

Add '-1b' to each side of the equation.
2a + b + -1b = 62 + -4b + -1b

Combine like terms: b + -1b = 0
2a + 0 = 62 + -4b + -1b
2a = 62 + -4b + -1b

Combine like terms: -4b + -1b = -5b
2a = 62 + -5b

Divide each side by '2'.
a = 31 + -2.5b

Simplifying
a = 31 + -2.5b

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