21-(13+4)=y+18

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Solution for 21-(13+4)=y+18 equation:


Simplifying
21 + -1(13 + 4) = y + 18

Combine like terms: 13 + 4 = 17
21 + -1(17) = y + 18

Multiply -1 * 17
21 + -17 = y + 18

Combine like terms: 21 + -17 = 4
4 = y + 18

Reorder the terms:
4 = 18 + y

Solving
4 = 18 + y

Solving for variable 'y'.

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

Add '-1y' to each side of the equation.
4 + -1y = 18 + y + -1y

Combine like terms: y + -1y = 0
4 + -1y = 18 + 0
4 + -1y = 18

Add '-4' to each side of the equation.
4 + -4 + -1y = 18 + -4

Combine like terms: 4 + -4 = 0
0 + -1y = 18 + -4
-1y = 18 + -4

Combine like terms: 18 + -4 = 14
-1y = 14

Divide each side by '-1'.
y = -14

Simplifying
y = -14

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