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(3-x)/4 = -3 // + 3
(3-x)/4+3 = 0
(3-x)/4+(3*4)/4 = 0
3*4-x+3 = 0
15-x = 0
(15-x)/4 = 0
(15-x)/4 = 0 // * 4
15-x = 0
15-x = 0 // - 15
-x = -15 // * -1
x = 15
x = 15
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