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x in (-oo:+oo)
x/50 = 42/100 // - 42/100
x/50-(42/100) = 0
x/50-21/50 = 0
1/50*x-21/50 = 0 // + 21/50
1/50*x = 21/50 // : 1/50
x = 21/50/1/50
x = 21
x = 21
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