Mathematics
Junior High
解説には、x+y=10 1.4x+1.2×0.7-10=1.76
と書いていたのですが、この ⇗-10がどこから来たのかがわかりまん(ﾟ`ω´ ﾟ)ﾟ教えてください(;Д;)(;Д;)
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