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(7*x-10)/2 = -26 // + 26
(7*x-10)/2+26 = 0
(7*x-10)/2+(2*26)/2 = 0
7*x+2*26-10 = 0
7*x+42 = 0
(7*x+42)/2 = 0
(7*x+42)/2 = 0 // * 2
7*x+42 = 0
7*x+42 = 0 // - 42
7*x = -42 // : 7
x = -42/7
x = -6
x = -6
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