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(2/7)*(14*x-21)+3 = 2*x-8 // - 2*x-8
(2/7)*(14*x-21)-(2*x)+3+8 = 0
(2/7)*(14*x-21)-2*x+3+8 = 0
2/7*(14*x-21)-2*x+3+8 = 0
2/7*(14*x-21)-2*x+3+8 = 0
2*x-6+3+8 = 0
2*x-3+8 = 0
2*x+5 = 0
2*x+5 = 0
2*x+5 = 0 // - 5
2*x = -5 // : 2
x = -5/2
x = -5/2
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