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(4/7)*x-((1/2)*x)-3/5 = -27/70 // + -27/70
(4/7)*x-((1/2)*x)-3/5-(-27/70) = 0
(4/7)*x+(-1/2)*x-3/5+27/70 = 0
1/14*x-3/14 = 0 // + 3/14
1/14*x = 3/14 // : 1/14
x = 3/14/1/14
x = 3
x = 3
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