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12.⅓(3x+½)=12.¼(8x+⅓)
4(3x+½)=3(8x+⅓)
12x+2=24x+1
24x-12x=2-1
12x=1
x=1/12
b. masing" ruas dikali 15
15.(3x+4)/5=15.(7x-8)/3
3(3x+4)=5(7x-8)
9x+12=35x-40
35x-9x=12+40
26x=52
x=2
c. masing" ruas dikali 12
12(x+4)/2+12(4x-1)/3=12(7x+8)/4
6(x+4)+4(4x-1)=3(7x+8)
6x+24+16x-4=21x+24
22x+20=21x+24
22x-21x=24-20
x=4
d. masing" ruas dikali 6
6(x-2)/2+6.⅓=6(x+2)/3-6.½
3(x-2)+2=2(x+2)-3
3x-6+2=2x+4-3
3x-4=2x+1
3x-2x=1+4
x=5