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(1/2)*(4*x-24) = 7*x-87 // - 7*x-87
(1/2)*(4*x-24)-(7*x)+87 = 0
(1/2)*(4*x-24)-7*x+87 = 0
1/2*(4*x-24)-7*x+87 = 0
1/2*(4*x-24)-7*x+87 = 0
87-5*x-12 = 0
75-5*x = 0
75-5*x = 0
75-5*x = 0 // - 75
-5*x = -75 // : -5
x = -75/(-5)
x = 15
x = 15
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