(1)X+31%=39.3 (2)X-18%=65.6 (3)8X+42=178 (4)20X-30=150,
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(1)X+31%=39.3 (2)X-18%=65.6 (3)8X+42=178 (4)20X-30=150,
(1)X+31%=39.3 (2)X-18%=65.6 (3)8X+42=178 (4)20X-30=150,
(1)X+31%=39.3 (2)X-18%=65.6 (3)8X+42=178 (4)20X-30=150,
(1)X+31%=39.3
x+0.31=39.3
x=39.3-0.31
x=38.99
(2)X-18%=65.6
x-0.18=65.6
x=65.6+0.18
x=65.78
(3)8X+42=178
8x=178-42
8x=136
x=136÷8
x=17
(4)20X-30=150
20x=150+30
20x=180
x=180÷20
x=9
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