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(1/2)*(4*x-5) = -90 // + 90
(1/2)*(4*x-5)+90 = 0
1/2*(4*x-5)+90 = 0
1/2*(4*x-5)+90 = 0
2*x+175/2 = 0
2*x+175/2 = 0
2*x+175/2 = 0 // - 175/2
2*x = -175/2 // : 2
x = -175/2/2
x = -175/4
x = -175/4
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