6,666,666×666,666 /1+2+3+4+5+6+5+4+3+2+1 − 777,777×777,777/1+2+3+4+5+6+7+6+5+4 +3+2+1

111111 1111110 is the simple expression.

Step-by-step explanation:

The expression to be solved:

First of all, let us solve the first term:

Now, the right term:

So, the expression to be solved becomes:

(sin 42)/31. = sinx)/37

sinx = 37 (sin42)/31

= 37× 0.66/31 = 0.787

x= 51.9

other angle opposite to y = 180-51.9-42

= 180- 93.9 =86.1

so

sin42)/31 = sin 86.1)/y

0.021 = 0.997 /y

y= 0.997/0.021 =47.47

you can't solve x because it is 2 linear equation and you only have one equation