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5*x-((1/3)*x)+4/7 = 61/21 // - 61/21
5*x-((1/3)*x)+4/7-(61/21) = 0
5*x+(-1/3)*x+4/7-61/21 = 0
14/3*x-7/3 = 0 // + 7/3
14/3*x = 7/3 // : 14/3
x = 7/3/14/3
x = 1/2
x = 1/2
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