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(-1/2)*(4*x-10) = -15 // + 15
(-1/2)*(4*x-10)+15 = 0
15-1/2*(4*x-10) = 0
15-1/2*(4*x-10) = 0
20-2*x = 0
20-2*x = 0
20-2*x = 0 // - 20
-2*x = -20 // : -2
x = -20/(-2)
x = 10
x = 10
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