1.2(y-10)=-2.8(y-9)

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Solution for 1.2(y-10)=-2.8(y-9) equation:


Simplifying
1.2(y + -10) = -2.8(y + -9)

Reorder the terms:
1.2(-10 + y) = -2.8(y + -9)
(-10 * 1.2 + y * 1.2) = -2.8(y + -9)
(-12 + 1.2y) = -2.8(y + -9)

Reorder the terms:
-12 + 1.2y = -2.8(-9 + y)
-12 + 1.2y = (-9 * -2.8 + y * -2.8)
-12 + 1.2y = (25.2 + -2.8y)

Solving
-12 + 1.2y = 25.2 + -2.8y

Solving for variable 'y'.

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

Add '2.8y' to each side of the equation.
-12 + 1.2y + 2.8y = 25.2 + -2.8y + 2.8y

Combine like terms: 1.2y + 2.8y = 4y
-12 + 4y = 25.2 + -2.8y + 2.8y

Combine like terms: -2.8y + 2.8y = 0.0
-12 + 4y = 25.2 + 0.0
-12 + 4y = 25.2

Add '12' to each side of the equation.
-12 + 12 + 4y = 25.2 + 12

Combine like terms: -12 + 12 = 0
0 + 4y = 25.2 + 12
4y = 25.2 + 12

Combine like terms: 25.2 + 12 = 37.2
4y = 37.2

Divide each side by '4'.
y = 9.3

Simplifying
y = 9.3

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