3a+4d=84

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Solution for 3a+4d=84 equation: 


Simplifying
3a + 4d = 84

Solving
3a + 4d = 84

Solving for variable 'a'.

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

Add '-4d' to each side of the equation.
3a + 4d + -4d = 84 + -4d

Combine like terms: 4d + -4d = 0
3a + 0 = 84 + -4d
3a = 84 + -4d

Divide each side by '3'.
a = 28 + -1.333333333d

Simplifying
a = 28 + -1.333333333d

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