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20*x:2-20*(x-3):4=20*2+20*x:5+20*(x-5):2
10x-5(x-3)=40+4x+10(x-5)
10x-5x+15=40+4x+10x-50
5x-14x=-10-15
-9x=-25
x=25/9
10x-5(x-3)=40+4x+10(x-5)
10x-5x+15=40+4x+10-50
10x-5x-4x-10x=40-50-15
-9x=-25/:(-9)
x=25/9= 2 7/9