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①1-3n=-8 -3n=-1-8 -3n=-9 ∴n=3 ②0.2x+12=0.3x+9 0.2x-0.3x=-12+9 -0.1x=-3 ∴x=-30 ③1/2x+1=1/3x-5 1/2x-1/3x=-1-5 1/6x=-6 ∴x=-36
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