Ответ:а) - 18 б) 6 1/3 в) -11/6 г) 7 д) 3/5 (0,6)
Пошаговое объяснение:
а) 3х+18 = -36
3х = 36-18
3х = -54
х = -54:3
х = -18
б) 13-x = 6 2/3
13-x = 20/3
-x = 20/3-13
-x = -19/3
x = 6 1/3
в) 4x-7x-9x = 22
-12x = 22
x = 22:(-12)
г) 2(x+6)=26 |:2
x+6 = 13
x = 13-6
x = 7
д) 3/7*(3-5x)-4/5*(x-3/5) = 0
9/7-15/7x-4/5x+12/25 = 0
309/175-15/7x-4/5x = 0 |*175
309-375x-140x = 0
309-515x = 0
-515x = -309 |:-515
x = 3/5