42-12=5(X-4)

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Solution for 42-12=5(X-4) equation:


Simplifying
42 + -12 = 5(X + -4)

Combine like terms: 42 + -12 = 30
30 = 5(X + -4)

Reorder the terms:
30 = 5(-4 + X)
30 = (-4 * 5 + X * 5)
30 = (-20 + 5X)

Solving
30 = -20 + 5X

Solving for variable 'X'.

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

Add '-5X' to each side of the equation.
30 + -5X = -20 + 5X + -5X

Combine like terms: 5X + -5X = 0
30 + -5X = -20 + 0
30 + -5X = -20

Add '-30' to each side of the equation.
30 + -30 + -5X = -20 + -30

Combine like terms: 30 + -30 = 0
0 + -5X = -20 + -30
-5X = -20 + -30

Combine like terms: -20 + -30 = -50
-5X = -50

Divide each side by '-5'.
X = 10

Simplifying
X = 10

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