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Mathematics 13 Online
OpenStudy (anonymous):

x-(3x-9)=-5

OpenStudy (zrsmith):

x-3x+9=-5 = -2x+9=-5 = -2x+9-9=-5-9 = -2x = -14 = -2x/-2 = -14/-2 = x =7 Remember that -(3x-9) is the same as -1(3x-9)

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