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(12/7)*x-((1/21)*x) = x-(10/3) // - x-(10/3)
(12/7)*x-((1/21)*x)-x+10/3 = 0
(12/7)*x+(-1/21)*x-x+10/3 = 0
2/3*x+10/3 = 0 // - 10/3
2/3*x = -10/3 // : 2/3
x = -10/3/2/3
x = -5
x = -5
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