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(4/7)*x-((1/5)*x)-9/10 = -177/175 // + -177/175
(4/7)*x-((1/5)*x)-9/10-(-177/175) = 0
(4/7)*x+(-1/5)*x-9/10+177/175 = 0
13/35*x+39/350 = 0 // - 39/350
13/35*x = -39/350 // : 13/35
x = -39/350/13/35
x = -3/10
x = -3/10
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