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x = 70×50÷40
x = 87,5
50 / (50+a) = 40 / 70
40(50+a) = 50×70
2000+40a = 3500
40a = 3500-2000
40a = 1500
a = 1500÷4 = 37,5
semoga bisa membantu. maaf kalo ada salah