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6x+4x=12-8
10x = 4
x = 4/10 = 2/5 =0,4
b. 5x+3 = 10
5x = 10-3
x = 7/5 = 1,4
d. 12x+5 = 13+8x
12x - 8x = 13-5
4x = 8
x = 8/4 =2
2. a. (x-x1)(x-x2) = (x-0)(x-4) = x(x-4) = x²-4
b. (x-x1)(x-x2) = (x-2)(x-5) = x²-2x-5x+10 = x²-7x+10