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2x+3=13
2x=13-3
2x=10/:2
x=5
b)5x-0,8=0,1+2x/*10
50x-8=1+20x
50x-20x=1+8
30x=9/:30
x=0,3
c)8x-0,2x=8x-0,1/*10
80x-2x=80x-1
80x-2x-80x=-1
-2x=-1/:(-2)
x=0,5
d) 0,01x+17=-0,16x/*100
x+1700=-16x
x+16x=-1700
17x=-1700/:17
x=-100
e)-0,07(10x-1)=0,3x/*100
-7(10x-1)=30x
-70x+7=30x
-70x-30x=-7
-100x=-7/:(-100)
x=7/100