9(y-1)-10(y-9)=77

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Solution for 9(y-1)-10(y-9)=77 equation:


Simplifying
9(y + -1) + -10(y + -9) = 77

Reorder the terms:
9(-1 + y) + -10(y + -9) = 77
(-1 * 9 + y * 9) + -10(y + -9) = 77
(-9 + 9y) + -10(y + -9) = 77

Reorder the terms:
-9 + 9y + -10(-9 + y) = 77
-9 + 9y + (-9 * -10 + y * -10) = 77
-9 + 9y + (90 + -10y) = 77

Reorder the terms:
-9 + 90 + 9y + -10y = 77

Combine like terms: -9 + 90 = 81
81 + 9y + -10y = 77

Combine like terms: 9y + -10y = -1y
81 + -1y = 77

Solving
81 + -1y = 77

Solving for variable 'y'.

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

Add '-81' to each side of the equation.
81 + -81 + -1y = 77 + -81

Combine like terms: 81 + -81 = 0
0 + -1y = 77 + -81
-1y = 77 + -81

Combine like terms: 77 + -81 = -4
-1y = -4

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

Simplifying
y = 4

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