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Anonymous
168
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84x2=168. There are other solutions. 56x3=168. 42x4=168. 28x6=168. 24x7=168. 21x8=168. 14x12=168.
3/7x + 5 = 87x(3/7x + 5) = 8(7x)3(7x/7x) + (7x)(5) = 8(7x)3 + 35x = 56x3 + 35x - 35x = 56x - 35x3 = 21x3/21 = 21x/211/7 = x