a)
(5x-9) / 4 +(5x-7)/4 = 1 // *4
[(5x-9)/4 +(5x-7)/4 ]*4 = 1*4
[(5x-9)/4 ]*4 + [(5x-7)/4]*4 = 4
1*(5x-9) + 1*(5x-7) = 4
5x-9 – 5x-7 =4
10x-16=4
10x=20
X=2
OTBET: 2
b)
2x – (2x-3)/3 = (x-6)/3 // *3
[2x - (2x-3)/3]*3=(x-6)/3 *3
2x*3 – (2x-3)/3 *3 =x-6
6x-3(2x-3)=x-6
6x-6x+9=x-6
X=9+6
X=15
OTBET:15
c)
[x/7 – (3x-1)/14]=2 // *14
x/7 *14 – (3x-1)/14 *14=2*14
2*x – (3x-1)*1=28
2x-3x+1=28
-x+1=28
X=-27
OTBET: -27
d)
(2x-3)/9 + (x-1)/5=2 // *45
[(2x-3)/9 +(x-1)/5 ]*45=2*45
[2x-3)/9 *45 + (x-1)/5 *45 =90
5*(2x-3) + 9(x-1)=90
10x-15+9x-9=90
19x=90+15+9
19x=114
X=6
OTBET:6