x-(25%+3/8+2)=7
x-(0.25+0.375+2)=7
x-2.625=7
x=7+2.625
x=9.625
x-(25%+3/8+2)=7
x-(1/4+3/8+2)=7
8x-(2+3+16)=56
8x=56+(2+3+16)
8x=77
x=77/8
x-(25%+3/8+2)=7
解：x-(25%+3/8+2)+(25%+3/8+2)=7+(25%+3/8+2)
x=9.875=79/8
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