4=-20x-15+21x

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Solution for 4=-20x-15+21x equation:


Simplifying
4 = -20x + -15 + 21x

Reorder the terms:
4 = -15 + -20x + 21x

Combine like terms: -20x + 21x = 1x
4 = -15 + 1x

Solving
4 = -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.
4 + -1x = -15 + 1x + -1x

Combine like terms: 1x + -1x = 0
4 + -1x = -15 + 0
4 + -1x = -15

Add '-4' to each side of the equation.
4 + -4 + -1x = -15 + -4

Combine like terms: 4 + -4 = 0
0 + -1x = -15 + -4
-1x = -15 + -4

Combine like terms: -15 + -4 = -19
-1x = -19

Divide each side by '-1'.
x = 19

Simplifying
x = 19

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