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4-((7*x)/5)-((3*x)/10)-2 = 1/15-x // - 1/15-x
x-((7*x)/5)-((3*x)/10)-(1/15)-2+4 = 0
(-7/5)*x+(-3/10)*x+x-1/15-2+4 = 0
29/15-7/10*x = 0 // - 29/15
-7/10*x = -29/15 // : -7/10
x = -29/15/(-7/10)
x = 58/21
x = 58/21
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