a)0=4(10-5x)-3(-3x-5)
0=40-20x+9x+15
0=55-11x
11x = 55 /:11
x = 5
b)x(x-1)-4=(x-2)(x+2)-x
-x-4 = +2x-2x-4-x
--x+2x-2x+x-4+4 = 0
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a)0=4(10-5x)-3(-3x-5)
0=40-20x+9x+15
0=55-11x
11x = 55 /:11
x = 5
b)x(x-1)-4=(x-2)(x+2)-x
-x-4 = +2x-2x-4-x
--x+2x-2x+x-4+4 = 0