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5-(7*x) = (1/2)*x+0 // - (1/2)*x+0
0-(7*x)-((1/2)*x)+5 = 0
(-1/2)*x-7*x+5 = 0
5-15/2*x = 0 // - 5
-15/2*x = -5 // : -15/2
x = -5/(-15/2)
x = 2/3
x = 2/3
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