23-08-2016
Mathematics

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Which equation is equivalent to 3[x + 3(4x – 5)] = 15x – 24?

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dalendrk dalendrk

28-08-2016

3[x + 3(4x - 5)] = 15x - 24
3(x + 12x - 15) = 15x - 24
3(13x - 15) = 15x - 24
39x - 45 = 15x - 24 |add 45 to both sides
39x = 15x + 21 |subtract 15x from both sides
24x = 21 |divide both sides by 24
x = 21/24
x = 7/8

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