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the number divided by -4 is increased by -63, the result is -45. What is the number? 

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x / (-4) + ( -63) = -45 <=> x / ( -4) = 63 - 45 <=> x / (-4) = 18 <=> x = 18 * (-4) <=> x = -72.
X/-4+(-63)=-45 -1/4x-63=-45 -1/4x=18 The number was -72

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