3/4x-2/5(45-x)=5

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3/4x-2/5(45-x)=5
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3/4x-2/5(45-x)=5
3/4x-2/5(45-x)=5

3/4x-2/5(45-x)=5
3/4x-2/5(45-x)=5
3/4x-18+2/5x=5
23/20x=23
x=20

3/4x-2/5(45-x)=5
15x-8(45-x)=100
23x=100+8*45
x=20

3/4x-2/5(45-x)=5
3/4x-18+2x/5=5
23/20x=23
x=20

(3/4+2/5)x-18=5
x=20

3/4x-2/5(45-x)=5
(3/4)x-18+(2/5)x=5
(15/20+8/20)x=23
(23/20)x=23
x=23*20/23
x=20

x=20