A=4a-(n-7)d

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Solution for A=4a-(n-7)d equation: 


Simplifying
A = 4a + -1(n + -7) * d

Reorder the terms:
A = 4a + -1(-7 + n) * d

Reorder the terms for easier multiplication:
A = 4a + -1d(-7 + n)
A = 4a + (-7 * -1d + n * -1d)
A = 4a + (7d + -1dn)

Solving
A = 4a + 7d + -1dn

Solving for variable 'A'.

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

Simplifying
A = 4a + 7d + -1dn

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