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5[2-6(x-1)] = 10
5(2-6x+6)=10
5(8-6x)=10
40-30x=10
-30x=-30
x=1
b)
2-[x-3(x-4)] = 5
2-(x-3x+12)=5
2-(-2x+12)=5
2+2x-12=5
2x-10=5
2x=15
x=15/2= 7,5
5[2-6x+6]=10
5[4-6x]=10
20-30x=10/-20
-30x=-10/-30
x=1/3
b)
2-[x-3(x-4)] = 5
2-[x-3x+12]=5
2-[-2x+12]=5
2+2x+12=5/-14
2x=9/2
x=4,5