-30+6+6=18+3t, -30+6-6=18+3t, t=14,18
1.3t+18-|6t-30|=6(1)t<竖逗氏63t+18-30+6t=69t=18t=2(2)t>余散指基63t+18-6t+30=63t=42t=14