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(2/5)*(2*x+10) = (1/5)*x-6 // - (1/5)*x-6
(2/5)*(2*x+10)-((1/5)*x)+6 = 0
(2/5)*(2*x+10)+(-1/5)*x+6 = 0
2/5*(2*x+10)-x/5+6 = 0
(2/5*5*(2*x+10))/5-x/5+(5*6)/5 = 0
2/5*5*(2*x+10)-x+5*6 = 0
3*x+20+30 = 0
3*x+50 = 0
(3*x+50)/5 = 0
(3*x+50)/5 = 0 // * 5
3*x+50 = 0
3*x+50 = 0 // - 50
3*x = -50 // : 3
x = -50/3
x = -50/3
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