X+2x+7x+1=21

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


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

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

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

Solving
1 + X + 9x = 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 + X + -1 + 9x = 21 + -1

Reorder the terms:
1 + -1 + X + 9x = 21 + -1

Combine like terms: 1 + -1 = 0
0 + X + 9x = 21 + -1
X + 9x = 21 + -1

Combine like terms: 21 + -1 = 20
X + 9x = 20

Add '-9x' to each side of the equation.
X + 9x + -9x = 20 + -9x

Combine like terms: 9x + -9x = 0
X + 0 = 20 + -9x
X = 20 + -9x

Simplifying
X = 20 + -9x

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