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a) x-7=2x
b) 0,3(a+2)=120
b) k+1,4k=k+200
3.
a) 3(2x+1)+7(6x-1)=23+5(12x-7)
6x+3+42x-7=23+60x-35
48x-60x=-12+4
-12x=-8 /:(-12)
x=2/3
b) x/2-2 i 1/4=3
x/2=3+2 i 1/4
x/2=5 i 1/4 /*2
x= 21/4 *2
x=21/2
x=10,5
c) 1/2x-(-1/3x)=4
1/2x+1/3x=4
3/6x+2/6x=4
5/6x=4 /*6/5
x=24/5
x=4 i 4/5
d) (x+1)/2-x/3=1 /*6
3(x+1)-2x=6
3x+3-2x=6
x=3
Mam nadzieje, ze jest dobrze ;)