0.4x+0.25(100-40)=31

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Solution for 0.4x+0.25(100-40)=31 equation:


Simplifying
0.4x + 0.25(100 + -40) = 31

Combine like terms: 100 + -40 = 60
0.4x + 0.25(60) = 31

Multiply 0.25 * 60
0.4x + 15 = 31

Reorder the terms:
15 + 0.4x = 31

Solving
15 + 0.4x = 31

Solving for variable 'x'.

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

Add '-15' to each side of the equation.
15 + -15 + 0.4x = 31 + -15

Combine like terms: 15 + -15 = 0
0 + 0.4x = 31 + -15
0.4x = 31 + -15

Combine like terms: 31 + -15 = 16
0.4x = 16

Divide each side by '0.4'.
x = 40

Simplifying
x = 40

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