50=20+(7-1)d

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Solution for 50=20+(7-1)d equation:


Simplifying
50 = 20 + (7 + -1) * d

Combine like terms: 7 + -1 = 6
50 = 20 + (6) * d

Solving
50 = 20 + 6d

Solving for variable 'd'.

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

Add '-6d' to each side of the equation.
50 + -6d = 20 + 6d + -6d

Combine like terms: 6d + -6d = 0
50 + -6d = 20 + 0
50 + -6d = 20

Add '-50' to each side of the equation.
50 + -50 + -6d = 20 + -50

Combine like terms: 50 + -50 = 0
0 + -6d = 20 + -50
-6d = 20 + -50

Combine like terms: 20 + -50 = -30
-6d = -30

Divide each side by '-6'.
d = 5

Simplifying
d = 5

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