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(5/7)*x-((2/3)*x)+1 = 3/7 // - 3/7
(5/7)*x-((2/3)*x)-(3/7)+1 = 0
(5/7)*x+(-2/3)*x-3/7+1 = 0
1/21*x+4/7 = 0 // - 4/7
1/21*x = -4/7 // : 1/21
x = -4/7/1/21
x = -12
x = -12
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