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(1/4)*x-(7/8) = 30-70 // - 30-70
(1/4)*x-(7/8)-30+70 = 0
(1/4)*x-7/8-30+70 = 0
1/4*x+313/8 = 0 // - 313/8
1/4*x = -313/8 // : 1/4
x = -313/8/1/4
x = -313/2
x = -313/2
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