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X/3+1/5 = (3*x)/7-1/2 // - (3*x)/7-1/2
X/3-((3*x)/7)+1/5-(-1/2) = 0
X/3+(-3/7)*x+1/5+1/2 = 0
1/3*X-3/7*x+7/10 = 0 // - 1/3*X+7/10
-3/7*x = -(1/3*X+7/10) // : -3/7
x = (-(1/3*X+7/10))/(-3/7)
x = 7/3*(1/3*X+7/10)
x = 7/3*(1/3*X+7/10)
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