а)9,5x - (3.2x + 1.8x) + 3.75 = 6.9
9,5x - 3.2x - 1.8x + 3.75 = 6.9
9,5x - 3.2x - 1.8x = 6.9-3.75
4,5x = 3,15
x = 3,15/4,5
х=0,7
а)9,5x - (3.2x + 1.8x) + 3.75 = 6.9
9,5x - 3.2x - 1.8x + 3.75 = 6.9
9,5x - 3.2x - 1.8x = 6.9-3.75
4,5x = 3,15
x = 3,15/4,5
х=0,7