№1.
а) 7x+10,5=0
x = -1,5
9x-8,5-7x-0,5 = 0
2x-9 = 0
x = 9/2
x = 4,5
№2.
в) 6x-9x+7-11 = 0
-3x-4 = 0
x = -4/3
x = -1,33
г) 9x-(3x-4-6x-2) = 0
9x-(-3x-6) = 0
9x+3x+6 = 0
12x+6 = 0
x = -6/12
x = -0,5
№1.
а) 7x+10,5=0
x = -1,5
9x-8,5-7x-0,5 = 0
2x-9 = 0
x = 9/2
x = 4,5
№2.
в) 6x-9x+7-11 = 0
-3x-4 = 0
x = -4/3
x = -1,33
г) 9x-(3x-4-6x-2) = 0
9x-(-3x-6) = 0
9x+3x+6 = 0
12x+6 = 0
x = -6/12
x = -0,5