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(1/4)*(2*x+9) = 19 // - 19
(1/4)*(2*x+9)-19 = 0
1/4*(2*x+9)-19 = 0
1/4*(2*x+9)-19 = 0
1/2*x-67/4 = 0
1/2*x-67/4 = 0
1/2*x-67/4 = 0 // + 67/4
1/2*x = 67/4 // : 1/2
x = 67/4/1/2
x = 67/2
x = 67/2
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