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3*(4-((1/5)*x)) = 2-((3/10)*x)+5 // - 2-((3/10)*x)+5
3*(4-((1/5)*x))+(3/10)*x-5-2 = 0
3*((-1/5)*x+4)+(3/10)*x-5-2 = 0
3*(4-1/5*x)+(3*x)/10-5-2 = 0
(3*10*(4-1/5*x))/10+(3*x)/10+(-5*10)/10+(-2*10)/10 = 0
3*10*(4-1/5*x)+3*x-5*10-2*10 = 0
120-3*x-50-20 = 0
70-3*x-20 = 0
50-3*x = 0
(50-3*x)/10 = 0
(50-3*x)/10 = 0 // * 10
50-3*x = 0
50-3*x = 0 // - 50
-3*x = -50 // : -3
x = -50/(-3)
x = 50/3
x = 50/3
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