d+7=3d+15

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Solution for d+7=3d+15 equation:


Simplifying
d + 7 = 3d + 15

Reorder the terms:
7 + d = 3d + 15

Reorder the terms:
7 + d = 15 + 3d

Solving
7 + d = 15 + 3d

Solving for variable 'd'.

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

Add '-3d' to each side of the equation.
7 + d + -3d = 15 + 3d + -3d

Combine like terms: d + -3d = -2d
7 + -2d = 15 + 3d + -3d

Combine like terms: 3d + -3d = 0
7 + -2d = 15 + 0
7 + -2d = 15

Add '-7' to each side of the equation.
7 + -7 + -2d = 15 + -7

Combine like terms: 7 + -7 = 0
0 + -2d = 15 + -7
-2d = 15 + -7

Combine like terms: 15 + -7 = 8
-2d = 8

Divide each side by '-2'.
d = -4

Simplifying
d = -4

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