1,5×{5+2,5×[7+5,5(32,5-x)]}=75/=5+2,5×[7+5,5(32,5-x)]=75÷1,5/=5+2,5×[7+5,5(32,5-x)]=50/=2,5×[7+5,5(32,5-x)]=50-5/=2,5×[7+5,5(32,5-x)]=45/=7+5,5(32,5-x)=45÷2,5 /=7+5,5(32,5-x)=18=5,5(32,5-x=18-7=5,5(32,5-x)=11=32,5-x=11÷5,5=32,5-x=2x=32,5-2/x=30,5
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