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7 = (2*x)/0.5-x // - (2*x)/0.5-x
x-((2*x)/0.5)+7 = 0
x-4*x+7 = 0
7-3*x = 0 // - 7
-3*x = -7 // : -3
x = -7/(-3)
x = 7/3
x = 7/3
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