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

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


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

Combine like terms: 5 + -4 = 1
5x + -15 + x(1) = 21

Reorder the terms for easier multiplication:
5x + -15 + 1x = 21

Reorder the terms:
-15 + 5x + 1x = 21

Combine like terms: 5x + 1x = 6x
-15 + 6x = 21

Solving
-15 + 6x = 21

Solving for variable 'x'.

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

Add '15' to each side of the equation.
-15 + 15 + 6x = 21 + 15

Combine like terms: -15 + 15 = 0
0 + 6x = 21 + 15
6x = 21 + 15

Combine like terms: 21 + 15 = 36
6x = 36

Divide each side by '6'.
x = 6

Simplifying
x = 6

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