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b)12a +9b+15c = 3(4a+3b+5c)c)10 p +15 r + 20 s = 5(2p+3r+4s)d)8e + 12 f + 0g +24= 4(2e+3f+6)e) - 6y - 9x-3 = -3(2y+3x+1)f)5x -15y - 20 z = 5(x-3y-4z)g)-6u +12w - 9y + 6 = 3(-3u+4w-3y+2)h)-9 +18a -27b +36c= -9(1-2a+3b-4c)i)-x - 1,5y - 7,5 z = -(x+1,5y+7,5z)j)-3,5a + 10,5 ab - 17,5ac = -0,5a (7-21b+35c)
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b)12a +9b+15c = 3(4a+3b+5c)
c)10 p +15 r + 20 s = 5(2p+3r+4s)
d)8e + 12 f + 0g +24= 4(2e+3f+6)
e) - 6y - 9x-3 = -3(2y+3x+1)
f)5x -15y - 20 z = 5(x-3y-4z)
g)-6u +12w - 9y + 6 = 3(-3u+4w-3y+2)
h)-9 +18a -27b +36c= -9(1-2a+3b-4c)
i)-x - 1,5y - 7,5 z = -(x+1,5y+7,5z)
j)-3,5a + 10,5 ab - 17,5ac = -0,5a (7-21b+35c)