7(4+x)=21

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Solution for 7(4+x)=21 equation: 


Simplifying
7(4 + x) = 21
(4 * 7 + x * 7) = 21
(28 + 7x) = 21

Solving
28 + 7x = 21

Solving for variable 'x'.

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

Add '-28' to each side of the equation.
28 + -28 + 7x = 21 + -28

Combine like terms: 28 + -28 = 0
0 + 7x = 21 + -28
7x = 21 + -28

Combine like terms: 21 + -28 = -7
7x = -7

Divide each side by '7'.
x = -1

Simplifying
x = -1

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