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(2/7)*(8*x-7) = -4 // + 4
(2/7)*(8*x-7)+4 = 0
2/7*(8*x-7)+4 = 0
2/7*(8*x-7)+4 = 0
16/7*x+2 = 0
16/7*x+2 = 0
16/7*x+2 = 0 // - 2
16/7*x = -2 // : 16/7
x = -2/16/7
x = -7/8
x = -7/8
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