(17.5-1.1x×3)÷2=(7-x)×0.95 17.5-3.3x=1.9*(7-x) 17.5-3.3x=13.3-1.9x 1.2x=4.2 x=3.5
(17.5-1.1x×3)÷2=(7-x)×0.95
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