.91(8000-y)+.97y=7800

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Solution for .91(8000-y)+.97y=7800 equation:


Simplifying
0.91(8000 + -1y) + 0.97y = 7800
(8000 * 0.91 + -1y * 0.91) + 0.97y = 7800
(7280 + -0.91y) + 0.97y = 7800

Combine like terms: -0.91y + 0.97y = 0.06y
7280 + 0.06y = 7800

Solving
7280 + 0.06y = 7800

Solving for variable 'y'.

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

Add '-7280' to each side of the equation.
7280 + -7280 + 0.06y = 7800 + -7280

Combine like terms: 7280 + -7280 = 0
0 + 0.06y = 7800 + -7280
0.06y = 7800 + -7280

Combine like terms: 7800 + -7280 = 520
0.06y = 520

Divide each side by '0.06'.
y = 8666.666667

Simplifying
y = 8666.666667

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