Question

a)8x/3 -9 = 3x/6 -5
b)9x/5 -4/3 = 2x -7/3
c)-2x -3/6 = 7x+4/5
deixem a conta! obg :)

Answer 1

8x/3 - 9 = 3x/6 - 5
mmc = 6
16x - 54 = 3x - 30
16x - 3x = -30 + 54
13x = 24
x = 24/13
------------------------
9x/5 - 4/3 = 2x - 7/3
mmc = 15
27x - 20 = 30x - 35
27x - 30x = -35 + 20
-3x = -15
x = 15/3
x = 5
------------------------
-2x - 3/6 = 7x + 4/5
mmc = 30
-60x - 15 = 210x + 24
-60x - 210x = 24 + 15
-270x = 39
x = -39/270 (:3)
x = -13/90

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