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-3,5x+7+3x=4 /-7
-0,5x=-3 /*(-2)
x=6
b) 2,4x-3=4,8+1,4x /+3
2,4x=7,8+1,4x /-1,4x
x=7,8
c) 3(x+1)=-1+x
3x+3=-1+x /-x-3
2x=-4 /:2
x=-2
d) x/2-3=1 /*2
x-6=2 /+6
x=8
e) 1/2x-1/3x=4 /*6
3x-2x=24
x=24
f) 0,1(1-x)=0,3(x+2)
0,1-0,1x=0,3x+0,6 /*10
1-x=3x+6 /+x-6
-5=4x /:4
-5/4=x
g) 2x+5,1=3(x-4,2)
2x+5,1=3x-12,6 /-2x+12,6
17,8=x
h) -5(x+2,4) -2(x-3)=-3
-5x-12-2x+6=-3
-7x-6=-3 /+6
-7x=3 /:(-7)
x=-3/7