30x-21y=15 (3で割る)
10x-7y=5...①
40x+16y=240 (8で割る)
5x+2y=30...②
①と②を連立方程式として解く
10x-7y=5
10x+4y=60
-11y=-55
y=5
y=5を①に代入する
10x-35=5
10x=40
x=4
x=4,y=5
こんな感じでしょうか？
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