.8-.4(40+x)=4

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Solution for .8-.4(40+x)=4 equation: 


Simplifying
0.8 + -0.4(40 + x) = 4
0.8 + (40 * -0.4 + x * -0.4) = 4
0.8 + (-16 + -0.4x) = 4

Combine like terms: 0.8 + -16 = -15.2
-15.2 + -0.4x = 4

Solving
-15.2 + -0.4x = 4

Solving for variable 'x'.

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

Add '15.2' to each side of the equation.
-15.2 + 15.2 + -0.4x = 4 + 15.2

Combine like terms: -15.2 + 15.2 = 0.0
0.0 + -0.4x = 4 + 15.2
-0.4x = 4 + 15.2

Combine like terms: 4 + 15.2 = 19.2
-0.4x = 19.2

Divide each side by '-0.4'.
x = -48

Simplifying
x = -48

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