15=10+.4(x-10)

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Solution for 15=10+.4(x-10) equation: 


Simplifying
15 = 10 + 0.4(x + -10)

Reorder the terms:
15 = 10 + 0.4(-10 + x)
15 = 10 + (-10 * 0.4 + x * 0.4)
15 = 10 + (-4 + 0.4x)

Combine like terms: 10 + -4 = 6
15 = 6 + 0.4x

Solving
15 = 6 + 0.4x

Solving for variable 'x'.

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

Add '-0.4x' to each side of the equation.
15 + -0.4x = 6 + 0.4x + -0.4x

Combine like terms: 0.4x + -0.4x = 0.0
15 + -0.4x = 6 + 0.0
15 + -0.4x = 6

Add '-15' to each side of the equation.
15 + -15 + -0.4x = 6 + -15

Combine like terms: 15 + -15 = 0
0 + -0.4x = 6 + -15
-0.4x = 6 + -15

Combine like terms: 6 + -15 = -9
-0.4x = -9

Divide each side by '-0.4'.
x = 22.5

Simplifying
x = 22.5

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