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-(21*x)-8 = (1/5)*(35*x-10) // - (1/5)*(35*x-10)
-((1/5)*(35*x-10))-(21*x)-8 = 0
(-1/5)*(35*x-10)-21*x-8 = 0
-1/5*(35*x-10)-21*x-8 = 0
-1/5*(35*x-10)-21*x-8 = 0
2-28*x-8 = 0
-28*x-6 = 0
-28*x-6 = 0
-28*x-6 = 0 // + 6
-28*x = 6 // : -28
x = 6/(-28)
x = -3/14
x = -3/14
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