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-3x + 0,5 = 9
-3x = 9 - 0,5
-3x = 8 1/2 /:(-3)
x = 17/2 * (-1/3)
x = -17/6
x = -2 5/6
b)
-3x + 0,5 = -2/5
-3x = -2/5 - 1/2
-3x = -4/10 - 5/10
-3x = -9/10 /:(-3)
x = (-9/10) * (-1/3)
x = 3/10
c)
-3x + 0,5 = √3 + 2
-3x = √3 + 2 - 0,5
-3x = √3 + 1,5 /:(-3)
x = - (√3 + 1,5) / 3