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(-2/7)*(4*x+2) = (3/28)*x-15 // - (3/28)*x-15
(-2/7)*(4*x+2)-((3/28)*x)+15 = 0
(-2/7)*(4*x+2)+(-3/28)*x+15 = 0
(-3*x)/28-2/7*(4*x+2)+15 = 0
(-2/7*28*(4*x+2))/28+(-3*x)/28+(15*28)/28 = 0
15*28-2/7*28*(4*x+2)-3*x = 0
420-35*x-16 = 0
404-35*x = 0
(404-35*x)/28 = 0
(404-35*x)/28 = 0 // * 28
404-35*x = 0
404-35*x = 0 // - 404
-35*x = -404 // : -35
x = -404/(-35)
x = 404/35
x = 404/35
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