d+d+d+d+12=d+d+30

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Solution for d+d+d+d+12=d+d+30 equation:


Simplifying
d + d + d + d + 12 = d + d + 30

Reorder the terms:
12 + d + d + d + d = d + d + 30

Combine like terms: d + d = 2d
12 + 2d + d + d = d + d + 30

Combine like terms: 2d + d = 3d
12 + 3d + d = d + d + 30

Combine like terms: 3d + d = 4d
12 + 4d = d + d + 30

Reorder the terms:
12 + 4d = 30 + d + d

Combine like terms: d + d = 2d
12 + 4d = 30 + 2d

Solving
12 + 4d = 30 + 2d

Solving for variable 'd'.

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

Add '-2d' to each side of the equation.
12 + 4d + -2d = 30 + 2d + -2d

Combine like terms: 4d + -2d = 2d
12 + 2d = 30 + 2d + -2d

Combine like terms: 2d + -2d = 0
12 + 2d = 30 + 0
12 + 2d = 30

Add '-12' to each side of the equation.
12 + -12 + 2d = 30 + -12

Combine like terms: 12 + -12 = 0
0 + 2d = 30 + -12
2d = 30 + -12

Combine like terms: 30 + -12 = 18
2d = 18

Divide each side by '2'.
d = 9

Simplifying
d = 9

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