7(x+9)=21

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Solution for 7(x+9)=21 equation: 


Simplifying
7(x + 9) = 21

Reorder the terms:
7(9 + x) = 21
(9 * 7 + x * 7) = 21
(63 + 7x) = 21

Solving
63 + 7x = 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 + 7x = 21 + -63

Combine like terms: 63 + -63 = 0
0 + 7x = 21 + -63
7x = 21 + -63

Combine like terms: 21 + -63 = -42
7x = -42

Divide each side by '7'.
x = -6

Simplifying
x = -6

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