7(d-1)-2(d+1)=4d

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Solution for 7(d-1)-2(d+1)=4d equation:


Simplifying
7(d + -1) + -2(d + 1) = 4d

Reorder the terms:
7(-1 + d) + -2(d + 1) = 4d
(-1 * 7 + d * 7) + -2(d + 1) = 4d
(-7 + 7d) + -2(d + 1) = 4d

Reorder the terms:
-7 + 7d + -2(1 + d) = 4d
-7 + 7d + (1 * -2 + d * -2) = 4d
-7 + 7d + (-2 + -2d) = 4d

Reorder the terms:
-7 + -2 + 7d + -2d = 4d

Combine like terms: -7 + -2 = -9
-9 + 7d + -2d = 4d

Combine like terms: 7d + -2d = 5d
-9 + 5d = 4d

Solving
-9 + 5d = 4d

Solving for variable 'd'.

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

Add '-4d' to each side of the equation.
-9 + 5d + -4d = 4d + -4d

Combine like terms: 5d + -4d = 1d
-9 + 1d = 4d + -4d

Combine like terms: 4d + -4d = 0
-9 + 1d = 0

Add '9' to each side of the equation.
-9 + 9 + 1d = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 1d = 0 + 9
1d = 0 + 9

Combine like terms: 0 + 9 = 9
1d = 9

Divide each side by '1'.
d = 9

Simplifying
d = 9

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