Question

Wat is the answer to 1.8+7n=9.5-4n

Answer 1

$1,8+7n=9,5-4n\ \ \ \ |Add\ 4n\ to\ each\ side\\\\ 1,8+11n=9,5\ \ \ \ |Subtract\ 1,8\\\\ 11n=7,7\ \ \ |Divide\ by\ 11\\\\ n=0,7\\\\Solution\ is\ n=0,7.$

Answer 2

The answer (usually called the 'solution') is the one and only number that 'n' can be if that equation is a true statement.  Here's a suggestion of a procedure you can use to find it:

1.8 + 7n  =  9.5 - 4n

Add  4n  to each side:               1.8 + 11n  =  9.5

Subtract  1.8  from each side:      11n  =  7.7

Divide each side by  11 :                n  =  0.7