3(21-4y)+7y=28

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Solution for 3(21-4y)+7y=28 equation:


Simplifying
3(21 + -4y) + 7y = 28
(21 * 3 + -4y * 3) + 7y = 28
(63 + -12y) + 7y = 28

Combine like terms: -12y + 7y = -5y
63 + -5y = 28

Solving
63 + -5y = 28

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 = 28 + -63

Combine like terms: 63 + -63 = 0
0 + -5y = 28 + -63
-5y = 28 + -63

Combine like terms: 28 + -63 = -35
-5y = -35

Divide each side by '-5'.
y = 7

Simplifying
y = 7

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