15=-5(4x+3)+21x

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Solution for 15=-5(4x+3)+21x equation:


Simplifying
15 = -5(4x + 3) + 21x

Reorder the terms:
15 = -5(3 + 4x) + 21x
15 = (3 * -5 + 4x * -5) + 21x
15 = (-15 + -20x) + 21x

Combine like terms: -20x + 21x = 1x
15 = -15 + 1x

Solving
15 = -15 + 1x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
15 + -1x = -15 + 1x + -1x

Combine like terms: 1x + -1x = 0
15 + -1x = -15 + 0
15 + -1x = -15

Add '-15' to each side of the equation.
15 + -15 + -1x = -15 + -15

Combine like terms: 15 + -15 = 0
0 + -1x = -15 + -15
-1x = -15 + -15

Combine like terms: -15 + -15 = -30
-1x = -30

Divide each side by '-1'.
x = 30

Simplifying
x = 30

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