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-59/21 = (3/7)*x-x-3 // - (3/7)*x-x-3
x-((3/7)*x)-59/21+3 = 0
(-3/7)*x+x-59/21+3 = 0
4/7*x+4/21 = 0 // - 4/21
4/7*x = -4/21 // : 4/7
x = -4/21/4/7
x = -1/3
x = -1/3
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