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(2/7)*x-10 = -(4*x)-55/7 // + -(4*x)-55/7
(2/7)*x+4*x-(-55/7)-10 = 0
(2/7)*x+4*x+55/7-10 = 0
30/7*x-15/7 = 0 // + 15/7
30/7*x = 15/7 // : 30/7
x = 15/7/30/7
x = 1/2
x = 1/2
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