20=40-7x

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Solution for 20=40-7x equation:


Simplifying
20 = 40 + -7x

Solving
20 = 40 + -7x

Solving for variable 'x'.

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

Add '7x' to each side of the equation.
20 + 7x = 40 + -7x + 7x

Combine like terms: -7x + 7x = 0
20 + 7x = 40 + 0
20 + 7x = 40

Add '-20' to each side of the equation.
20 + -20 + 7x = 40 + -20

Combine like terms: 20 + -20 = 0
0 + 7x = 40 + -20
7x = 40 + -20

Combine like terms: 40 + -20 = 20
7x = 20

Divide each side by '7'.
x = 2.857142857

Simplifying
x = 2.857142857

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