10-0.4y=30

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Solution for 10-0.4y=30 equation: 


Simplifying
10 + -0.4y = 30

Solving
10 + -0.4y = 30

Solving for variable 'y'.

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

Add '-10' to each side of the equation.
10 + -10 + -0.4y = 30 + -10

Combine like terms: 10 + -10 = 0
0 + -0.4y = 30 + -10
-0.4y = 30 + -10

Combine like terms: 30 + -10 = 20
-0.4y = 20

Divide each side by '-0.4'.
y = -50

Simplifying
y = -50

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