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a) 12ab+4ac-6ad =2a(6b+2c-3d)
b) x(y+z)+2(y+z)=(y+z)(x+2)
2.
a) 2/3(6x - 9) = 12
6x-9=18
6x=27
x=4.5
b) 1/10 ( 25x - 40) +2 = 3/4 (8x+12) - 9
4(25x-40)+80=30(8x+12)-360
100x-160+80=240x+360-360
-140x=80
x=-4/7
a)12ab+4ac-6ad =2a(6b+2c-3d)
b)x(y+z)+2(y+z)= xy+xz+2y+2z
2.
a)4x-6=12
4x=6
x=1,5
b)1/10 ( 25x - 40) +2 = 3/4 (8x+12) - 9
2,5x-4+2=6x+9-9
3,5x=-2