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3/4 = -x/72 // + -x/72
3/4-(-x/72) = 0
(1/72)*x+3/4 = 0
1/72*x+3/4 = 0 // - 3/4
1/72*x = -3/4 // : 1/72
x = -3/4/1/72
x = -54
x = -54
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