3=7-5a

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Solution for 3=7-5a equation:


Simplifying
3 = 7 + -5a

Solving
3 = 7 + -5a

Solving for variable 'a'.

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

Add '5a' to each side of the equation.
3 + 5a = 7 + -5a + 5a

Combine like terms: -5a + 5a = 0
3 + 5a = 7 + 0
3 + 5a = 7

Add '-3' to each side of the equation.
3 + -3 + 5a = 7 + -3

Combine like terms: 3 + -3 = 0
0 + 5a = 7 + -3
5a = 7 + -3

Combine like terms: 7 + -3 = 4
5a = 4

Divide each side by '5'.
a = 0.8

Simplifying
a = 0.8

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