a) 4 x - x=8,7 b) 3y+5y=9,6 c) a+a+8,154=32 d) 7k-4k-55,2=63,12

4x - x = 8,73x = 8,7x = 8,7 : 3x = 2,93y + 5y = 9,68y = 9,6y = 9,6 : 8y = 1,2a + a + 8,154 = 322a + 8,154 = 322a = 32 - 8,1542a = 23,846a = 23,846 : 2a = 11,9237k - 4k - 55,2 = 63,123k - 55,2 = 63,123k = 63,12 + 55,23k = 118,32k = 118,32 : 3k = 39,44