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0,2x+0,3= -0,5
0,2x=-0,5-0,3
0,2x=-0,8 /:0,2
x=4
b)
5x+2=7-3x
5x+3x=7-2
8x=5/:8
x=5/8
c)
3(x-1)=0
3x-3=0
3x=3 /:3
x=1
d)
-6(x+1)= 24
-6x-6=24
-6x=24+6
-6x=30 /:(-6)
x=-5
e)
-7(x-2)=3x-1
-7x+14=3x-1
-7x-3x=-1-14
-10x=-15/:(-10)
x=1,5
f)
4(x-1)=6(1+x)
4x-4=6+6x
4x-6x=6+4
-2x=10 /:(-2)
x=-5