-0.9=0.45(y+3)

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Solution for -0.9=0.45(y+3) equation: 


Simplifying
-0.9 = 0.45(y + 3)

Reorder the terms:
-0.9 = 0.45(3 + y)
-0.9 = (3 * 0.45 + y * 0.45)
-0.9 = (1.35 + 0.45y)

Solving
-0.9 = 1.35 + 0.45y

Solving for variable 'y'.

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

Add '-0.45y' to each side of the equation.
-0.9 + -0.45y = 1.35 + 0.45y + -0.45y

Combine like terms: 0.45y + -0.45y = 0.00
-0.9 + -0.45y = 1.35 + 0.00
-0.9 + -0.45y = 1.35

Add '0.9' to each side of the equation.
-0.9 + 0.9 + -0.45y = 1.35 + 0.9

Combine like terms: -0.9 + 0.9 = 0.0
0.0 + -0.45y = 1.35 + 0.9
-0.45y = 1.35 + 0.9

Combine like terms: 1.35 + 0.9 = 2.25
-0.45y = 2.25

Divide each side by '-0.45'.
y = -5

Simplifying
y = -5

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