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(-2/5)*(10*x-25) = 8*x+4 // - 8*x+4
(-2/5)*(10*x-25)-(8*x)-4 = 0
(-2/5)*(10*x-25)-8*x-4 = 0
-2/5*(10*x-25)-8*x-4 = 0
-2/5*(10*x-25)-8*x-4 = 0
10-12*x-4 = 0
6-12*x = 0
6-12*x = 0
6-12*x = 0 // - 6
-12*x = -6 // : -12
x = -6/(-12)
x = 1/2
x = 1/2
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