7.8=3.5+a

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Solution for 7.8=3.5+a equation:


Simplifying
7.8 = 3.5 + a

Solving
7.8 = 3.5 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
7.8 + -1a = 3.5 + a + -1a

Combine like terms: a + -1a = 0
7.8 + -1a = 3.5 + 0
7.8 + -1a = 3.5

Add '-7.8' to each side of the equation.
7.8 + -7.8 + -1a = 3.5 + -7.8

Combine like terms: 7.8 + -7.8 = 0.0
0.0 + -1a = 3.5 + -7.8
-1a = 3.5 + -7.8

Combine like terms: 3.5 + -7.8 = -4.3
-1a = -4.3

Divide each side by '-1'.
a = 4.3

Simplifying
a = 4.3

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