3(x-7)=21

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Solution for 3(x-7)=21 equation: 


Simplifying
3(x + -7) = 21

Reorder the terms:
3(-7 + x) = 21
(-7 * 3 + x * 3) = 21
(-21 + 3x) = 21

Solving
-21 + 3x = 21

Solving for variable 'x'.

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

Add '21' to each side of the equation.
-21 + 21 + 3x = 21 + 21

Combine like terms: -21 + 21 = 0
0 + 3x = 21 + 21
3x = 21 + 21

Combine like terms: 21 + 21 = 42
3x = 42

Divide each side by '3'.
x = 14

Simplifying
x = 14

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