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109 = x+(1/2)*x+x-15 // - x+(1/2)*x+x-15
15-x-((1/2)*x)-x+109 = 0
(-1/2)*x-x-x+15+109 = 0
124-5/2*x = 0 // - 124
-5/2*x = -124 // : -5/2
x = -124/(-5/2)
x = 248/5
x = 248/5
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