Question

[(x+90:1)x5+100]:600=2012:2012

Answer 1

((x+90)•5+100):600=1
(x+90)•5+100=1•600
(x+90)•5+100=600
(x+90)•5=600-100
(x+90)•5=500
x+90=500:5
x+90=100
x=100-90
x=10

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