5.50*(200-y)+3.5y=920

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Solution for 5.50*(200-y)+3.5y=920 equation: 


Simplifying
5.50(200 + -1y) + 3.5y = 920
(200 * 5.50 + -1y * 5.50) + 3.5y = 920
(1100 + -5.5y) + 3.5y = 920

Combine like terms: -5.5y + 3.5y = -2y
1100 + -2y = 920

Solving
1100 + -2y = 920

Solving for variable 'y'.

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

Add '-1100' to each side of the equation.
1100 + -1100 + -2y = 920 + -1100

Combine like terms: 1100 + -1100 = 0
0 + -2y = 920 + -1100
-2y = 920 + -1100

Combine like terms: 920 + -1100 = -180
-2y = -180

Divide each side by '-2'.
y = 90

Simplifying
y = 90

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