(a+b)-5(a+b)-84=0

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Solution for (a+b)-5(a+b)-84=0 equation:


Simplifying
(a + b) + -5(a + b) + -84 = 0

Remove parenthesis around (a + b)
a + b + -5(a + b) + -84 = 0
a + b + (a * -5 + b * -5) + -84 = 0
a + b + (-5a + -5b) + -84 = 0

Reorder the terms:
-84 + a + -5a + b + -5b = 0

Combine like terms: a + -5a = -4a
-84 + -4a + b + -5b = 0

Combine like terms: b + -5b = -4b
-84 + -4a + -4b = 0

Solving
-84 + -4a + -4b = 0

Solving for variable 'a'.

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

Add '84' to each side of the equation.
-84 + -4a + 84 + -4b = 0 + 84

Reorder the terms:
-84 + 84 + -4a + -4b = 0 + 84

Combine like terms: -84 + 84 = 0
0 + -4a + -4b = 0 + 84
-4a + -4b = 0 + 84

Combine like terms: 0 + 84 = 84
-4a + -4b = 84

Add '4b' to each side of the equation.
-4a + -4b + 4b = 84 + 4b

Combine like terms: -4b + 4b = 0
-4a + 0 = 84 + 4b
-4a = 84 + 4b

Divide each side by '-4'.
a = -21 + -1b

Simplifying
a = -21 + -1b

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