313+a=400

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Solution for 313+a=400 equation: 


Simplifying
313 + a = 400

Solving
313 + a = 400

Solving for variable 'a'.

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

Add '-313' to each side of the equation.
313 + -313 + a = 400 + -313

Combine like terms: 313 + -313 = 0
0 + a = 400 + -313
a = 400 + -313

Combine like terms: 400 + -313 = 87
a = 87

Simplifying
a = 87

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