1.1 6321-5351/(34+53) = 6278
1.2 5986/73 + 66174/82 = 889
1.3 x/19 = 26, x = 19*26 = 494
1.4 238/x = 14, x = 238/14 = 17
1.5 (x+7)/8 = 9, x+7 = 8*9 = 72, x = 72-7 = 65
1.6 x/8+7 = 9, x/8 = 9-7 = 2, x = 8*2 = 16
1.7 48/(x+3) = 6, x+3 = 48/6 = 6, x = 6-3 = 3
1.8 48/x+3 = 6, 48/x = 6-3 = 3, x = 48/3 = 16