21-[5g-(3g-1)]-g=5g-12

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Solution for 21-[5g-(3g-1)]-g=5g-12 equation:


Simplifying
21 + -1[5g + -1(3g + -1)] + -1g = 5g + -12

Reorder the terms:
21 + -1[5g + -1(-1 + 3g)] + -1g = 5g + -12
21 + -1[5g + (-1 * -1 + 3g * -1)] + -1g = 5g + -12
21 + -1[5g + (1 + -3g)] + -1g = 5g + -12

Reorder the terms:
21 + -1[1 + 5g + -3g] + -1g = 5g + -12

Combine like terms: 5g + -3g = 2g
21 + -1[1 + 2g] + -1g = 5g + -12
21 + [1 * -1 + 2g * -1] + -1g = 5g + -12
21 + [-1 + -2g] + -1g = 5g + -12

Combine like terms: 21 + -1 = 20
20 + -2g + -1g = 5g + -12

Combine like terms: -2g + -1g = -3g
20 + -3g = 5g + -12

Reorder the terms:
20 + -3g = -12 + 5g

Solving
20 + -3g = -12 + 5g

Solving for variable 'g'.

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

Add '-5g' to each side of the equation.
20 + -3g + -5g = -12 + 5g + -5g

Combine like terms: -3g + -5g = -8g
20 + -8g = -12 + 5g + -5g

Combine like terms: 5g + -5g = 0
20 + -8g = -12 + 0
20 + -8g = -12

Add '-20' to each side of the equation.
20 + -20 + -8g = -12 + -20

Combine like terms: 20 + -20 = 0
0 + -8g = -12 + -20
-8g = -12 + -20

Combine like terms: -12 + -20 = -32
-8g = -32

Divide each side by '-8'.
g = 4

Simplifying
g = 4

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