(y-3.7)+1.8=4.7     y-3.7=4.7-1.8     y-3.7=2.9   y=2.9=3.7     y=6.6

(y - 3.7) + 1.8 =4.7

y = 1.1

y = 2.9

y = 2.9 + 1.1 = 4.7