21x=7(20-x)

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Solution for 21x=7(20-x) equation:


Simplifying
21x = 7(20 + -1x)
21x = (20 * 7 + -1x * 7)
21x = (140 + -7x)

Solving
21x = 140 + -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.
21x + 7x = 140 + -7x + 7x

Combine like terms: 21x + 7x = 28x
28x = 140 + -7x + 7x

Combine like terms: -7x + 7x = 0
28x = 140 + 0
28x = 140

Divide each side by '28'.
x = 5

Simplifying
x = 5

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