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-3x+7=2x-18 ---> 7+18=2x-3x ----> 25=5x ----> x=5
3x=18 x=18/3 x=6
3x-18 = 9 Adding 18 on both the sides we get, 3x = 27 Dividing both sides by 3 we get, x = 9.
If x-3x=18 then x equals -9
18=3(3x-6)