21=7(x+3)

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


Simplifying
21 = 7(x + 3)

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

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

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

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

Solving
0 = 7x

Solving for variable 'x'.

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

Add '-7x' to each side of the equation.
0 + -7x = 7x + -7x
Remove the zero:
-7x = 7x + -7x

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

Divide each side by '-7'.
x = 0

Simplifying
x = 0

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