0.8x-0.4(40+x)=4

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Solution for 0.8x-0.4(40+x)=4 equation:


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

Reorder the terms:
-16 + 0.8x + -0.4x = 4

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

Solving
-16 + 0.4x = 4

Solving for variable 'x'.

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

Add '16' to each side of the equation.
-16 + 16 + 0.4x = 4 + 16

Combine like terms: -16 + 16 = 0
0 + 0.4x = 4 + 16
0.4x = 4 + 16

Combine like terms: 4 + 16 = 20
0.4x = 20

Divide each side by '0.4'.
x = 50

Simplifying
x = 50

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