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x in (-oo:+oo)
x/1+x/2+(3*x)/2 = 300 // - 300
x/1+x/2+(3*x)/2-300 = 0
x+x/2+(3*x)/2-300 = 0
3*x-300 = 0 // + 300
3*x = 300 // : 3
x = 300/3
x = 100
x = 100
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