0.4(7-9)=0.3(y+4)

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Solution for 0.4(7-9)=0.3(y+4) equation: 


Simplifying
0.4(7 + -9) = 0.3(y + 4)

Combine like terms: 7 + -9 = -2
0.4(-2) = 0.3(y + 4)

Multiply 0.4 * -2
-0.8 = 0.3(y + 4)

Reorder the terms:
-0.8 = 0.3(4 + y)
-0.8 = (4 * 0.3 + y * 0.3)
-0.8 = (1.2 + 0.3y)

Solving
-0.8 = 1.2 + 0.3y

Solving for variable 'y'.

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

Add '-0.3y' to each side of the equation.
-0.8 + -0.3y = 1.2 + 0.3y + -0.3y

Combine like terms: 0.3y + -0.3y = 0.0
-0.8 + -0.3y = 1.2 + 0.0
-0.8 + -0.3y = 1.2

Add '0.8' to each side of the equation.
-0.8 + 0.8 + -0.3y = 1.2 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + -0.3y = 1.2 + 0.8
-0.3y = 1.2 + 0.8

Combine like terms: 1.2 + 0.8 = 2
-0.3y = 2

Divide each side by '-0.3'.
y = -6.666666667

Simplifying
y = -6.666666667

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