-2a-(-3a)+-(21)-4(-a+b)=

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Solution for -2a-(-3a)+-(21)-4(-a+b)= equation:


Simplifying
-2a + -1(-3a) + -1(21) + -4(-1a + b) = 0

Remove parenthesis around (-3a)
-2a + -1 * -3a + -1(21) + -4(-1a + b) = 0

Multiply -1 * -3
-2a + 3a + -1(21) + -4(-1a + b) = 0

Multiply -1 * 21
-2a + 3a + -21 + -4(-1a + b) = 0
-2a + 3a + -21 + (-1a * -4 + b * -4) = 0
-2a + 3a + -21 + (4a + -4b) = 0

Reorder the terms:
-21 + -2a + 3a + 4a + -4b = 0

Combine like terms: -2a + 3a = 1a
-21 + 1a + 4a + -4b = 0

Combine like terms: 1a + 4a = 5a
-21 + 5a + -4b = 0

Solving
-21 + 5a + -4b = 0

Solving for variable 'a'.

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

Add '21' to each side of the equation.
-21 + 5a + 21 + -4b = 0 + 21

Reorder the terms:
-21 + 21 + 5a + -4b = 0 + 21

Combine like terms: -21 + 21 = 0
0 + 5a + -4b = 0 + 21
5a + -4b = 0 + 21

Combine like terms: 0 + 21 = 21
5a + -4b = 21

Add '4b' to each side of the equation.
5a + -4b + 4b = 21 + 4b

Combine like terms: -4b + 4b = 0
5a + 0 = 21 + 4b
5a = 21 + 4b

Divide each side by '5'.
a = 4.2 + 0.8b

Simplifying
a = 4.2 + 0.8b

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