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(1/2)*(4*x-8)+7 = -11 // + 11
(1/2)*(4*x-8)+7+11 = 0
1/2*(4*x-8)+7+11 = 0
1/2*(4*x-8)+7+11 = 0
2*x+3+11 = 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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