x+20x = 60000
21x = 60000
x = 60000/21 = 2857.'142857' recurring
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If: 20x+5y = 15 Then: y = -4x+3
6x + 12x + 2x = 80 20x = 80 x = 4
x2 + 20x +0 =30 [(20/2)2 =100] x2 + 20x + 100 =30 +100 √(x+10)2=√130 x+10=√130 x= −10+√130 √ means square root
2
4x + 10 + 3x = 40 - 3x 4x + 10 + 3x + 3x = 40 20x = 40 x = 2