4)
x-(1 5/7-1/3)=-1 2/7÷0.5
x-(1 15/21 - 7/21) = -9/7 * 2/1
x - 1 8/21 = -18/7
x = -18/7 + 1 8/21
x = -18/7 + 29/21
x = -54/21 + 29/21
x = -25/21
x = -1 4/21
3)
-3/7y=-6/7×2.5
-3/7y = -6/7 * 5/2
-3/7y = -15/7
y = -15/7 *(-7/2)
y = 15/2
y = 7,5
4)
x-(1 5/7-1/3)=-1 2/7÷0.5
x-(1 15/21 - 7/21) = -9/7 * 2/1
x - 1 8/21 = -18/7
x = -18/7 + 1 8/21
x = -18/7 + 29/21
x = -54/21 + 29/21
x = -25/21
x = -1 4/21
3)
-3/7y=-6/7×2.5
-3/7y = -6/7 * 5/2
-3/7y = -15/7
y = -15/7 *(-7/2)
y = 15/2
y = 7,5