4-8y-7+1.2y=6.3+2y+14.7
A little more organized:
-8y + 1.2y + 4 - 7 = 2y + 6.3 + 14.7
-6.8y - 3 = 2y + 21
-8.8y - 3 = 21
-8.8y = 21 + 3
-8.8y = 24
8.8y = -24
y = -24 / 8.8
y = -24 / (88/10)
y = -24 * 10/88
y = -240 / 88
Final answer: $$y = \frac{-30}{11}$$