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10*(2-x)+4*x = (-3/10)*(x+3) // - (-3/10)*(x+3)
10*(2-x)-((-3/10)*(x+3))+4*x = 0
10*(2-x)+(3/10)*(x+3)+4*x = 0
10*(2-x)+3/10*(x+3)+4*x = 0
10*(2-x)+3/10*(x+3)+4*x = 0
4*x-97/10*x+209/10 = 0
209/10-57/10*x = 0
209/10-57/10*x = 0
209/10-57/10*x = 0 // - 209/10
-57/10*x = -209/10 // : -57/10
x = -209/10/(-57/10)
x = 11/3
x = 11/3
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