805=40(20+(-.4y))+15y

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Solution for 805=40(20+(-.4y))+15y equation:


Simplifying
805 = 40(20 + (-0.4y)) + 15y
805 = (20 * 40 + (-0.4y) * 40) + 15y
805 = (800 + -16y) + 15y

Combine like terms: -16y + 15y = -1y
805 = 800 + -1y

Solving
805 = 800 + -1y

Solving for variable 'y'.

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

Add 'y' to each side of the equation.
805 + y = 800 + -1y + y

Combine like terms: -1y + y = 0
805 + y = 800 + 0
805 + y = 800

Add '-805' to each side of the equation.
805 + -805 + y = 800 + -805

Combine like terms: 805 + -805 = 0
0 + y = 800 + -805
y = 800 + -805

Combine like terms: 800 + -805 = -5
y = -5

Simplifying
y = -5

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