4x-5(3-x)=21

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


Simplifying
4x + -5(3 + -1x) = 21
4x + (3 * -5 + -1x * -5) = 21
4x + (-15 + 5x) = 21

Reorder the terms:
-15 + 4x + 5x = 21

Combine like terms: 4x + 5x = 9x
-15 + 9x = 21

Solving
-15 + 9x = 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 + 9x = 21 + 15

Combine like terms: -15 + 15 = 0
0 + 9x = 21 + 15
9x = 21 + 15

Combine like terms: 21 + 15 = 36
9x = 36

Divide each side by '9'.
x = 4

Simplifying
x = 4

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