5(x-3)=21

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


Simplifying
5(x + -3) = 21

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

Solving
-15 + 5x = 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 + 5x = 21 + 15

Combine like terms: -15 + 15 = 0
0 + 5x = 21 + 15
5x = 21 + 15

Combine like terms: 21 + 15 = 36
5x = 36

Divide each side by '5'.
x = 7.2

Simplifying
x = 7.2

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