9(x-1)+3x+2(x+1)=21

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Solution for 9(x-1)+3x+2(x+1)=21 equation: 


Simplifying
9(x + -1) + 3x + 2(x + 1) = 21

Reorder the terms:
9(-1 + x) + 3x + 2(x + 1) = 21
(-1 * 9 + x * 9) + 3x + 2(x + 1) = 21
(-9 + 9x) + 3x + 2(x + 1) = 21

Reorder the terms:
-9 + 9x + 3x + 2(1 + x) = 21
-9 + 9x + 3x + (1 * 2 + x * 2) = 21
-9 + 9x + 3x + (2 + 2x) = 21

Reorder the terms:
-9 + 2 + 9x + 3x + 2x = 21

Combine like terms: -9 + 2 = -7
-7 + 9x + 3x + 2x = 21

Combine like terms: 9x + 3x = 12x
-7 + 12x + 2x = 21

Combine like terms: 12x + 2x = 14x
-7 + 14x = 21

Solving
-7 + 14x = 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 + 14x = 21 + 7

Combine like terms: -7 + 7 = 0
0 + 14x = 21 + 7
14x = 21 + 7

Combine like terms: 21 + 7 = 28
14x = 28

Divide each side by '14'.
x = 2

Simplifying
x = 2

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