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9/10-5*x-((3/7)*x) = -279/70 // + -279/70
9/10-5*x-((3/7)*x)-(-279/70) = 0
(-3/7)*x-5*x+9/10+279/70 = 0
171/35-38/7*x = 0 // - 171/35
-38/7*x = -171/35 // : -38/7
x = -171/35/(-38/7)
x = 9/10
x = 9/10
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