5,37 + 7,7 = 8,75 + 10,3x
13,07 = 8,75 + 10,3x
-10,3x = 8,75 - 13,07
-10,3x = -4,32
x = 216/515
5(4 - x) - 12 = 7(2x - 5)
20 - 5x - 12 = 14x - 35
8 - 5x = 14x - 35
-5x - 14x = -35 - 8
-19x = -43
x = 43/19
x = 2 5/19
5,37 + 7,7 = 8,75 + 10,3x
13,07 = 8,75 + 10,3x
-10,3x = 8,75 - 13,07
-10,3x = -4,32
x = 216/515
2)5(4 - x) - 12 = 7(2x - 5)
20 - 5x - 12 = 14x - 35
8 - 5x = 14x - 35
-5x - 14x = -35 - 8
-19x = -43
x = 43/19
x = 2 5/19