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128-/48+6.7-(x:3+15)/:3=104 ( unde / reprezinta paranteza patrata, )

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128-[ 48+6 x 7-(x:3+15)] : 3=104
128-104 =[ 48+6 x 7-(x:3+15)] : 3
 24=[ 48+6 x 7-(x:3+15)] : 3
 24 *3=[ 48+6 x 7-(x:3+15)]
48+42-(x:3+15) = 72
90 - (x:3+15) = 72
x:3+15=90-72
x:3= 18-15
x:3 = 3
x=9

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