Im assuming that the commas are decimal points 8.4( y - 17.9) = 4.2 distribute 8.4 inside the parenthesis 8.4y - 150.36 Take 150.36 to the other side 8.4y = 154.56 divide by 8.4 on both sides to isolate y
[tex] \frac{8.4y}{8.4} [/tex] = [tex] \frac{154.56}{8.4} [/tex] 8.4 and 8.4 cancels out y = 18.4
