-6+3(1+7d)=28

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Solution for -6+3(1+7d)=28 equation: 


Simplifying
-6 + 3(1 + 7d) = 28
-6 + (1 * 3 + 7d * 3) = 28
-6 + (3 + 21d) = 28

Combine like terms: -6 + 3 = -3
-3 + 21d = 28

Solving
-3 + 21d = 28

Solving for variable 'd'.

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

Add '3' to each side of the equation.
-3 + 3 + 21d = 28 + 3

Combine like terms: -3 + 3 = 0
0 + 21d = 28 + 3
21d = 28 + 3

Combine like terms: 28 + 3 = 31
21d = 31

Divide each side by '21'.
d = 1.476190476

Simplifying
d = 1.476190476

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