(y+3d)-(-9y+7d)=

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Solution for (y+3d)-(-9y+7d)= equation:


Simplifying
(y + 3d) + -1(-9y + 7d) = 0

Reorder the terms:
(3d + y) + -1(-9y + 7d) = 0

Remove parenthesis around (3d + y)
3d + y + -1(-9y + 7d) = 0

Reorder the terms:
3d + y + -1(7d + -9y) = 0
3d + y + (7d * -1 + -9y * -1) = 0
3d + y + (-7d + 9y) = 0

Reorder the terms:
3d + -7d + y + 9y = 0

Combine like terms: 3d + -7d = -4d
-4d + y + 9y = 0

Combine like terms: y + 9y = 10y
-4d + 10y = 0

Solving
-4d + 10y = 0

Solving for variable 'd'.

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

Add '-10y' to each side of the equation.
-4d + 10y + -10y = 0 + -10y

Combine like terms: 10y + -10y = 0
-4d + 0 = 0 + -10y
-4d = 0 + -10y
Remove the zero:
-4d = -10y

Divide each side by '-4'.
d = 2.5y

Simplifying
d = 2.5y

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