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(1/2)*(4*x-10) = 9 // - 9
(1/2)*(4*x-10)-9 = 0
1/2*(4*x-10)-9 = 0
1/2*(4*x-10)-9 = 0
2*x-14 = 0
2*x-14 = 0
2*x-14 = 0 // + 14
2*x = 14 // : 2
x = 14/2
x = 7
x = 7
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