15=8-.4x

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Solution for 15=8-.4x equation:


Simplifying
15 = 8 + -0.4x

Solving
15 = 8 + -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 = 8 + -0.4x + 0.4x

Combine like terms: -0.4x + 0.4x = 0.0
15 + 0.4x = 8 + 0.0
15 + 0.4x = 8

Add '-15' to each side of the equation.
15 + -15 + 0.4x = 8 + -15

Combine like terms: 15 + -15 = 0
0 + 0.4x = 8 + -15
0.4x = 8 + -15

Combine like terms: 8 + -15 = -7
0.4x = -7

Divide each side by '0.4'.
x = -17.5

Simplifying
x = -17.5

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