4(4)-y(5)=21

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Solution for 4(4)-y(5)=21 equation: 


Simplifying
4(4) + -1y(5) = 21

Multiply 4 * 4
16 + -1y(5) = 21

Reorder the terms for easier multiplication:
16 + -1 * 5y = 21

Multiply -1 * 5
16 + -5y = 21

Solving
16 + -5y = 21

Solving for variable 'y'.

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

Add '-16' to each side of the equation.
16 + -16 + -5y = 21 + -16

Combine like terms: 16 + -16 = 0
0 + -5y = 21 + -16
-5y = 21 + -16

Combine like terms: 21 + -16 = 5
-5y = 5

Divide each side by '-5'.
y = -1

Simplifying
y = -1

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