66=y+21

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Solution for 66=y+21 equation:


Simplifying
66 = y + 21

Reorder the terms:
66 = 21 + y

Solving
66 = 21 + 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.
66 + -1y = 21 + y + -1y

Combine like terms: y + -1y = 0
66 + -1y = 21 + 0
66 + -1y = 21

Add '-66' to each side of the equation.
66 + -66 + -1y = 21 + -66

Combine like terms: 66 + -66 = 0
0 + -1y = 21 + -66
-1y = 21 + -66

Combine like terms: 21 + -66 = -45
-1y = -45

Divide each side by '-1'.
y = 45

Simplifying
y = 45

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