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(2/5)*(10+15) = 4*x-4 // - 4*x-4
(2/5)*(10+15)-(4*x)+4 = 0
(2/5)*(10+15)-4*x+4 = 0
14-4*x = 0 // - 14
-4*x = -14 // : -4
x = -14/(-4)
x = 7/2
x = 7/2
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