a) 3(2x-1)= 4x+5
6x-3=4x+5
2x=4
x=2
b) 480: [18-(6-x)] +4=10
480: [18-6+x] +4=10
480: [12+x] +4=10
40: [12+x] +1=1
12+x=39
x=27
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a) 3(2x-1)= 4x+5
6x-3=4x+5
2x=4
x=2
b) 480: [18-(6-x)] +4=10
480: [18-6+x] +4=10
480: [12+x] +4=10
40: [12+x] +1=1
12+x=39
x=27