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X in (-oo:+oo)
3573 = X+4*X+(21*X)/100 // - X+4*X+(21*X)/100
3573-X-(4*X)-((21*X)/100) = 0
(-21/100)*X-X-4*X+3573 = 0
3573-521/100*X = 0 // - 3573
-521/100*X = -3573 // : -521/100
X = -3573/(-521/100)
X = 357300/521
X = 357300/521
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