21(3)-5y=100

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Solution for 21(3)-5y=100 equation: 


Simplifying
21(3) + -5y = 100

Multiply 21 * 3
63 + -5y = 100

Solving
63 + -5y = 100

Solving for variable 'y'.

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

Add '-63' to each side of the equation.
63 + -63 + -5y = 100 + -63

Combine like terms: 63 + -63 = 0
0 + -5y = 100 + -63
-5y = 100 + -63

Combine like terms: 100 + -63 = 37
-5y = 37

Divide each side by '-5'.
y = -7.4

Simplifying
y = -7.4

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