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4 [ 3/4 (x+3) + 1/2 (x-1)] = 10.4
3 (x+3) + 2 (x-1) = 40
3x + 9 + 2x - 2 = 40
5x + 7 = 40
5x = 33
x = 6,6
3/4x + 9/4 + 1/2 x - 5 = 0
3/4x + 1/2x = 5 - 9/4 <-------samakan penyebut x 4
3x + 2x = 20 - 9
5x = 11
x = 11/5
x = 1 1/5