0.2(x+30)-0.03(x-40)=17.4

0.2(x+30)-0.03(x-40)=17.4

0.2x + 6 - 0.03x + 1.2 = 17.4

0.17x = 17.4 - 6 - 1.2
0.17x = 10.2
x = 60