2x+9=.8x+21

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Solution for 2x+9=.8x+21 equation:


Simplifying
2x + 9 = 0.8x + 21

Reorder the terms:
9 + 2x = 0.8x + 21

Reorder the terms:
9 + 2x = 21 + 0.8x

Solving
9 + 2x = 21 + 0.8x

Solving for variable 'x'.

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

Add '-0.8x' to each side of the equation.
9 + 2x + -0.8x = 21 + 0.8x + -0.8x

Combine like terms: 2x + -0.8x = 1.2x
9 + 1.2x = 21 + 0.8x + -0.8x

Combine like terms: 0.8x + -0.8x = 0.0
9 + 1.2x = 21 + 0.0
9 + 1.2x = 21

Add '-9' to each side of the equation.
9 + -9 + 1.2x = 21 + -9

Combine like terms: 9 + -9 = 0
0 + 1.2x = 21 + -9
1.2x = 21 + -9

Combine like terms: 21 + -9 = 12
1.2x = 12

Divide each side by '1.2'.
x = 10

Simplifying
x = 10

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