a) 2(5a-3)-a-4(3a-2)=0 10a-6-a-12a+8=0 10a-a-12a=-8+6 -3a=-2 /:(-3) a=2/3 b)2b-(1-b)=11-b 2b-1+b=11-b 2b+b+b=11+1 4b=12 /:4 b=3 c)2/5(x-2)=x+4 /*5 2x-4=5x+20 2x-5x=20+4 -3x=24 /:(-3) x=-8 d)3y-2(y-1)=-6 3y-2y+2=-6 y=-6-2 y=-8 e)3(3-5y)=90-5(3y-2) 9-15y=90-15y+10 -15y+15y=90+10-9 0=91
a) 2(5a-3)-a-4(3a-2)=0 10a-6-a-12a+8=0 -3a+2=0 -3a=-2 |:(-3) a=⅔ b)2b-(1-b)=11-b 2b-1+b=11-b 3b+b=11+1 4b=12 |:4 b=3 c)2/5(x-2)=x+4 ⅖x-⅘=x+4 ⅖x-x=4+⅘ -⅗x=4⅘ |:(-⅗) x=²⁴/₅*(-⁵/₃) x=8*(-1) x=-8 d)3y-2(y-1)=-6 3y-2y+2=-6 y=-6-2 y=-8 e)3(3-5y)=90-5(3y-2) 9-15y=90-15y+10 -15y+15y=90+10-9 0=91 <-równanie sprzeczne
