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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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