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--------------------(×15)
(3.3x ) - (2.15) = 5.x
9x - 30 = 5x
9x - 5x = 30
4x = 30
x = 7,5
b) 3/5 x - ½x = 2x - ¾
--------------------------(×20)
(4.3x) - (10.x) = (2x.20) - (5.3)
12x - 10x = 40x - 15
2x - 40x = - 15
-38x = -15
x = 15/38