81-3x=42x+21

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Solution for 81-3x=42x+21 equation:


Simplifying
81 + -3x = 42x + 21

Reorder the terms:
81 + -3x = 21 + 42x

Solving
81 + -3x = 21 + 42x

Solving for variable 'x'.

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

Add '-42x' to each side of the equation.
81 + -3x + -42x = 21 + 42x + -42x

Combine like terms: -3x + -42x = -45x
81 + -45x = 21 + 42x + -42x

Combine like terms: 42x + -42x = 0
81 + -45x = 21 + 0
81 + -45x = 21

Add '-81' to each side of the equation.
81 + -81 + -45x = 21 + -81

Combine like terms: 81 + -81 = 0
0 + -45x = 21 + -81
-45x = 21 + -81

Combine like terms: 21 + -81 = -60
-45x = -60

Divide each side by '-45'.
x = 1.333333333

Simplifying
x = 1.333333333

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