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X1=x%
A2=37
X2=(100-x)%
34,45=35*x% + 37*(100-x)%/100%
3545=35*x - 37*x + 3700
3545 + 3700=72*x
155=2*x
x=77,5%
X1=77,5%
X2=100%-77,5% = 22,5%