7*x+1+2*x+x=21

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Solution for 7*x+1+2*x+x=21 equation: 


Simplifying
7x + 1 + 2x + x = 21

Reorder the terms:
1 + 7x + 2x + x = 21

Combine like terms: 7x + 2x = 9x
1 + 9x + x = 21

Combine like terms: 9x + x = 10x
1 + 10x = 21

Solving
1 + 10x = 21

Solving for variable 'x'.

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

Add '-1' to each side of the equation.
1 + -1 + 10x = 21 + -1

Combine like terms: 1 + -1 = 0
0 + 10x = 21 + -1
10x = 21 + -1

Combine like terms: 21 + -1 = 20
10x = 20

Divide each side by '10'.
x = 2

Simplifying
x = 2

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