18y-(21(y-1))=4

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Solution for 18y-(21(y-1))=4 equation:


Simplifying
18y + -1(21(y + -1)) = 4

Reorder the terms:
18y + -1(21(-1 + y)) = 4
18y + -1((-1 * 21 + y * 21)) = 4
18y + -1((-21 + 21y)) = 4
18y + (-21 * -1 + 21y * -1) = 4
18y + (21 + -21y) = 4

Reorder the terms:
21 + 18y + -21y = 4

Combine like terms: 18y + -21y = -3y
21 + -3y = 4

Solving
21 + -3y = 4

Solving for variable 'y'.

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

Add '-21' to each side of the equation.
21 + -21 + -3y = 4 + -21

Combine like terms: 21 + -21 = 0
0 + -3y = 4 + -21
-3y = 4 + -21

Combine like terms: 4 + -21 = -17
-3y = -17

Divide each side by '-3'.
y = 5.666666667

Simplifying
y = 5.666666667

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