(1):4-600x-6.5=0.02-100x-7.5
500x=4+1-0.02
x=0.00996
(2):217.5-6(t+3)=22.5t-25(0.4t-2.8)
217.5-6t-18=22.5t-10t+70
18.5t=129.5
t=7
(1):4-600x-6.5=0.02-100x-7.5
500x=4+1-0.02
x=0.00996
(2):217.5-6(t+3)=22.5t-25(0.4t-2.8)
217.5-6t-18=22.5t-10t+70
18.5t=129.5
t=7