5(-1)-10y=20

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Solution for 5(-1)-10y=20 equation: 


Simplifying
5(-1) + -10y = 20

Multiply 5 * -1
-5 + -10y = 20

Solving
-5 + -10y = 20

Solving for variable 'y'.

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

Add '5' to each side of the equation.
-5 + 5 + -10y = 20 + 5

Combine like terms: -5 + 5 = 0
0 + -10y = 20 + 5
-10y = 20 + 5

Combine like terms: 20 + 5 = 25
-10y = 25

Divide each side by '-10'.
y = -2.5

Simplifying
y = -2.5

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