45=-3(21-y)+3(y-2)

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Solution for 45=-3(21-y)+3(y-2) equation:


Simplifying
45 = -3(21 + -1y) + 3(y + -2)
45 = (21 * -3 + -1y * -3) + 3(y + -2)
45 = (-63 + 3y) + 3(y + -2)

Reorder the terms:
45 = -63 + 3y + 3(-2 + y)
45 = -63 + 3y + (-2 * 3 + y * 3)
45 = -63 + 3y + (-6 + 3y)

Reorder the terms:
45 = -63 + -6 + 3y + 3y

Combine like terms: -63 + -6 = -69
45 = -69 + 3y + 3y

Combine like terms: 3y + 3y = 6y
45 = -69 + 6y

Solving
45 = -69 + 6y

Solving for variable 'y'.

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

Add '-6y' to each side of the equation.
45 + -6y = -69 + 6y + -6y

Combine like terms: 6y + -6y = 0
45 + -6y = -69 + 0
45 + -6y = -69

Add '-45' to each side of the equation.
45 + -45 + -6y = -69 + -45

Combine like terms: 45 + -45 = 0
0 + -6y = -69 + -45
-6y = -69 + -45

Combine like terms: -69 + -45 = -114
-6y = -114

Divide each side by '-6'.
y = 19

Simplifying
y = 19

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