7 + 3х – 12х = 3x +1.
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2

Step-by-step explanation:

7 + 3х – 12х = 3x +1

7-9x=3x+1

-9x-3x=1-7

-12x=-6

x= -6/-12

cut minus from numerator and denominator

x=6/12

x=2

(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

a

step-by-step explanation:

the answer is a