2d+d+7+5[40-(2d+7)]=81

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Solution for 2d+d+7+5[40-(2d+7)]=81 equation:


Simplifying
2d + d + 7 + 5[40 + -1(2d + 7)] = 81

Reorder the terms:
2d + d + 7 + 5[40 + -1(7 + 2d)] = 81
2d + d + 7 + 5[40 + (7 * -1 + 2d * -1)] = 81
2d + d + 7 + 5[40 + (-7 + -2d)] = 81

Combine like terms: 40 + -7 = 33
2d + d + 7 + 5[33 + -2d] = 81
2d + d + 7 + [33 * 5 + -2d * 5] = 81
2d + d + 7 + [165 + -10d] = 81

Reorder the terms:
7 + 165 + 2d + d + -10d = 81

Combine like terms: 7 + 165 = 172
172 + 2d + d + -10d = 81

Combine like terms: 2d + d = 3d
172 + 3d + -10d = 81

Combine like terms: 3d + -10d = -7d
172 + -7d = 81

Solving
172 + -7d = 81

Solving for variable 'd'.

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

Add '-172' to each side of the equation.
172 + -172 + -7d = 81 + -172

Combine like terms: 172 + -172 = 0
0 + -7d = 81 + -172
-7d = 81 + -172

Combine like terms: 81 + -172 = -91
-7d = -91

Divide each side by '-7'.
d = 13

Simplifying
d = 13

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