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I want to understand what the stept in finding 135 is 3/7 of what number?

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135 = 3/7 x
7/3 * 135 = 7/3 * 3/7 x
315 = x

(3/7) n = 135
multiply both sides by 7
3 n = 945
divide both sides by 3
n = 315

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