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6 = (1/4)*x-9 // - (1/4)*x-9
6-((1/4)*x)+9 = 0
(-1/4)*x+6+9 = 0
15-1/4*x = 0 // - 15
-1/4*x = -15 // : -1/4
x = -15/(-1/4)
x = 60
x = 60
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