28+21X+12-3X=4

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Solution for 28+21X+12-3X=4 equation: 


Simplifying
28 + 21X + 12 + -3X = 4

Reorder the terms:
28 + 12 + 21X + -3X = 4

Combine like terms: 28 + 12 = 40
40 + 21X + -3X = 4

Combine like terms: 21X + -3X = 18X
40 + 18X = 4

Solving
40 + 18X = 4

Solving for variable 'X'.

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

Add '-40' to each side of the equation.
40 + -40 + 18X = 4 + -40

Combine like terms: 40 + -40 = 0
0 + 18X = 4 + -40
18X = 4 + -40

Combine like terms: 4 + -40 = -36
18X = -36

Divide each side by '18'.
X = -2

Simplifying
X = -2

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