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4(x-1)-20=28
4x+4-20=28+20
4x=48-4
4x=44
x=44/4
x=11
la segunda es
2(x-5)+3(x+5)=20
2x-10+3x+15020
2x+3x+15=20+10
2x+3x+15=30
5x=30-15
5x=15
x=15/5
x=3