40=100-4X

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Solution for 40=100-4X equation:


Simplifying
40 = 100 + -4X

Solving
40 = 100 + -4X

Solving for variable 'X'.

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

Add '4X' to each side of the equation.
40 + 4X = 100 + -4X + 4X

Combine like terms: -4X + 4X = 0
40 + 4X = 100 + 0
40 + 4X = 100

Add '-40' to each side of the equation.
40 + -40 + 4X = 100 + -40

Combine like terms: 40 + -40 = 0
0 + 4X = 100 + -40
4X = 100 + -40

Combine like terms: 100 + -40 = 60
4X = 60

Divide each side by '4'.
X = 15

Simplifying
X = 15

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