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x+20x+101=0
21x+101=0
21x=-101
x=101
x=101÷21
x=4,8
b)
y+4y-45=0
5y-45=0
5y=45
y=45÷5
y=9
c)
x+4x-46=0
5x-46=0
5x=46
x=46÷5
x=9,2
d)
x-19x+60=0
-18x+60=0
-18x=-60
x=-60÷-18
x=60÷18
x=10÷3
x=3,3
e)
x-8x-84=0
-7x-84=0
-7x=84
x=84÷-7
x=-12