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2x=18-6
2x=12/:2
x=6
spr. 2*6+6=18
12+6=18
18=18
b) 1/2x+0,5=0,125
½x=0,125-0,5
½x=-0,375 /:½
x=-³⁷⁵/₁₀₀₀ * ²/₁
x=-³⁷⁵/₅₀₀
x=-0,75
spr.
½ *( -0,75) +0,5=0,125
-0,375+0,5=0,125
0,125=0,125
c) 1,8x+3-2,8x=x+1
1,8x-2,8x-x=1-3
-2x=-2/(-2)
x=1
spr.
1,8*1+3-2,8*1=1+1
1,8+3-2,8=2
4,8-2,8=2
2=2
d) (3x-2)*2+x-4=4x+10
6x-4+x-4=4x+10
6x+x-4x=10+4+4
3x=18/:3
x=6
spr.
(3*6-2)*2+6-4=4*6+10
(18-2)*2+2=24+10
16*2+2=34
32+2=34
34=34