40-7x=2x+21

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Solution for 40-7x=2x+21 equation:


Simplifying
40 + -7x = 2x + 21

Reorder the terms:
40 + -7x = 21 + 2x

Solving
40 + -7x = 21 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
40 + -7x + -2x = 21 + 2x + -2x

Combine like terms: -7x + -2x = -9x
40 + -9x = 21 + 2x + -2x

Combine like terms: 2x + -2x = 0
40 + -9x = 21 + 0
40 + -9x = 21

Add '-40' to each side of the equation.
40 + -40 + -9x = 21 + -40

Combine like terms: 40 + -40 = 0
0 + -9x = 21 + -40
-9x = 21 + -40

Combine like terms: 21 + -40 = -19
-9x = -19

Divide each side by '-9'.
x = 2.111111111

Simplifying
x = 2.111111111

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