c)12,4 - x = 20 | -12,4
-x = 20 - 12,4
-x = 7,6
x = -7,6
d)-3x = 3 3/4 | :(-3)
x = 15/4 : (-3)
x= 15/4 • (-1/3)
x= -3/4
e)2(3x -4) = 10
2•3x -4 • 2 = 10
6x - 8 = 10 | + 8
6x = 10 + 8
6x = 18 | :6
x = 3
f)-3(5+2x) = 15
-3•5 + (-3) •2x= 15
-15 -6x = 15 |+15
-6x = 30 |: (-6)
x= 30 : (-6)
x=-5
g)4(x+3) -2 = -6
4•x + 4•3 -2= -6
4x+ 12-2 =-6
4x +10 =-6 |-10
4x= -6 -10
4x =-16 |:4
x= -16 :4
x=-4
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