7=Y+18-15

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Solution for 7=Y+18-15 equation:


Simplifying
7 = Y + 18 + -15

Reorder the terms:
7 = 18 + -15 + Y

Combine like terms: 18 + -15 = 3
7 = 3 + Y

Solving
7 = 3 + 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.
7 + -1Y = 3 + Y + -1Y

Combine like terms: Y + -1Y = 0
7 + -1Y = 3 + 0
7 + -1Y = 3

Add '-7' to each side of the equation.
7 + -7 + -1Y = 3 + -7

Combine like terms: 7 + -7 = 0
0 + -1Y = 3 + -7
-1Y = 3 + -7

Combine like terms: 3 + -7 = -4
-1Y = -4

Divide each side by '-1'.
Y = 4

Simplifying
Y = 4

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