6x+7+x=21

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Solution for 6x+7+x=21 equation: 


Simplifying
6x + 7 + x = 21

Reorder the terms:
7 + 6x + x = 21

Combine like terms: 6x + x = 7x
7 + 7x = 21

Solving
7 + 7x = 21

Solving for variable 'x'.

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

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

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

Combine like terms: 21 + -7 = 14
7x = 14

Divide each side by '7'.
x = 2

Simplifying
x = 2

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