A=a+(n-7)d

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Solution for A=a+(n-7)d equation: 


Simplifying
A = a + (n + -7) * d

Reorder the terms:
A = a + (-7 + n) * d

Reorder the terms for easier multiplication:
A = a + d(-7 + n)
A = a + (-7 * d + n * d)
A = a + (-7d + dn)

Solving
A = a + -7d + dn

Solving for variable 'A'.

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

Simplifying
A = a + -7d + dn

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