(1+0.8%)x+(1+1.1%)×(42-x)=(1+1%)×42

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(1+0.8%)x+(1+1.1%)×(42-x)=(1+1%)×42

(1+0.8%)x+(1+1.1%)×(42-x)=(1+1%)×42
1.008x+1.011*42-1.011x=1.01*42
-0.003x=-0.001*42
x=14

(1+0.8%)x+(1+1.1%)×42-(1+1.1%)x=(1+1%)×42
(1+0.8%)x-(1+1.1%)x=(1+1%)×42-(1+1.1%)×42
(-0.3%)x=(-0.1%)×42
x=14

x+0.8%x+1.011×42-1.011x=1.01×42
1.011x-1.008x=0.042
x=14