10-1=7Y+21

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Solution for 10-1=7Y+21 equation: 


Simplifying
10 + -1 = 7Y + 21

Combine like terms: 10 + -1 = 9
9 = 7Y + 21

Reorder the terms:
9 = 21 + 7Y

Solving
9 = 21 + 7Y

Solving for variable 'Y'.

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

Add '-7Y' to each side of the equation.
9 + -7Y = 21 + 7Y + -7Y

Combine like terms: 7Y + -7Y = 0
9 + -7Y = 21 + 0
9 + -7Y = 21

Add '-9' to each side of the equation.
9 + -9 + -7Y = 21 + -9

Combine like terms: 9 + -9 = 0
0 + -7Y = 21 + -9
-7Y = 21 + -9

Combine like terms: 21 + -9 = 12
-7Y = 12

Divide each side by '-7'.
Y = -1.714285714

Simplifying
Y = -1.714285714

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