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180 = 7*x-(3*((-6*x)/15)) // - 7*x-(3*((-6*x)/15))
3*((-6*x)/15)-(7*x)+180 = 0
3*((-6*x)/15)-7*x+180 = 0
180-41/5*x = 0 // - 180
-41/5*x = -180 // : -41/5
x = -180/(-41/5)
x = 900/41
x = 900/41
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