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5*x-((15/3)*x)+4*9*x+(12/6)*x-18 = 0
5*x-5*x+4*9*x+(12/6)*x-18 = 0
38*x-18 = 0 // + 18
38*x = 18 // : 38
x = 18/38
x = 9/19
x = 9/19
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