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y+3y+10y=48
14y=48||:14
y=3,42
b)15+y=51-y
2y=36 ||:2
y=18
2.
a)1/3x-2=x+2 |3
x-6=3x+6
-2x=12 ||:(-2)
x=-6
b)1-6/7x=4/7 |7
7-6x=4
-6x=3 ||:(-6)
x=-0,5
c)6(1/4x-2)=18
6/4x-12=18 |4
6x-48=72
6x=24 ||:6
x=4
d)x/6-1/6=1 |6
x-1=6
x=6+1
x=7
e)-2(2x-1)=x/3
-4x+2=x/3 |3
-12x+6=x
-13x=6 ||(-6)
x=-2 1/6
f)2/5(3-x)=-2
6/5-0,4x=-2
1,2-0,4x=-2
-0,4x=3,2 ||:(-0,4)
x=-8
g)3/4(2-3x)=-6
6/4-9/4x=-6 |4
6-9x=-6
-9x=-12 ||:(-9)
x=9/12
x=3/4
x=0,75
h)1/5(x-3)=9-x |5
x-3=45-5x
6x=48 ||:6
x=8