a) x+(x-15)*1/2=2(x-15)
b) 21+19-1/4x=x
c) x-3(50-x)=18
c)x-150x=18
x-150x=18
151x=18 /151
x=8.38
x+1/2x-7,5=2x-30
x+1/2x-2x=-30+7,5
0,5x=-22,5/0,5
-x=-45
x=45
b)21+19-1/4x=x
-1/4x-x=-21-19
-1,25x=-40/1,25
-x=-32
x=32
c)x-3(50-x)=18
x-150+bx=18
x-3x=18+150
-2x=168/2
-x=84
x=-84
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c)x-150x=18
x-150x=18
151x=18 /151
x=8.38
a) x+(x-15)*1/2=2(x-15)
x+1/2x-7,5=2x-30
x+1/2x-2x=-30+7,5
0,5x=-22,5/0,5
-x=-45
x=45
b)21+19-1/4x=x
-1/4x-x=-21-19
-1,25x=-40/1,25
-x=-32
x=32
c)x-3(50-x)=18
x-150+bx=18
x-3x=18+150
-2x=168/2
-x=84
x=-84