21x-2=20x+25-42

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Solution for 21x-2=20x+25-42 equation:


Simplifying
21x + -2 = 20x + 25 + -42

Reorder the terms:
-2 + 21x = 20x + 25 + -42

Reorder the terms:
-2 + 21x = 25 + -42 + 20x

Combine like terms: 25 + -42 = -17
-2 + 21x = -17 + 20x

Solving
-2 + 21x = -17 + 20x

Solving for variable 'x'.

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

Add '-20x' to each side of the equation.
-2 + 21x + -20x = -17 + 20x + -20x

Combine like terms: 21x + -20x = 1x
-2 + 1x = -17 + 20x + -20x

Combine like terms: 20x + -20x = 0
-2 + 1x = -17 + 0
-2 + 1x = -17

Add '2' to each side of the equation.
-2 + 2 + 1x = -17 + 2

Combine like terms: -2 + 2 = 0
0 + 1x = -17 + 2
1x = -17 + 2

Combine like terms: -17 + 2 = -15
1x = -15

Divide each side by '1'.
x = -15

Simplifying
x = -15

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