21=5x+7y

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Solution for 21=5x+7y equation:


Simplifying
21 = 5x + 7y

Solving
21 = 5x + 7y

Solving for variable 'x'.

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

Add '-5x' to each side of the equation.
21 + -5x = 5x + -5x + 7y

Combine like terms: 5x + -5x = 0
21 + -5x = 0 + 7y
21 + -5x = 7y

Add '-21' to each side of the equation.
21 + -21 + -5x = -21 + 7y

Combine like terms: 21 + -21 = 0
0 + -5x = -21 + 7y
-5x = -21 + 7y

Divide each side by '-5'.
x = 4.2 + -1.4y

Simplifying
x = 4.2 + -1.4y

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