7(9-3x)=21

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Solution for 7(9-3x)=21 equation: 


Simplifying
7(9 + -3x) = 21
(9 * 7 + -3x * 7) = 21
(63 + -21x) = 21

Solving
63 + -21x = 21

Solving for variable 'x'.

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

Add '-63' to each side of the equation.
63 + -63 + -21x = 21 + -63

Combine like terms: 63 + -63 = 0
0 + -21x = 21 + -63
-21x = 21 + -63

Combine like terms: 21 + -63 = -42
-21x = -42

Divide each side by '-21'.
x = 2

Simplifying
x = 2

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