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helppppp
1) Twice a number equals 5 times the same number plus 18. Which is the number?
2) If a + b= 29 , b + c = 45, a + c = 44 Find a + b + c = ?
3) Solve the equation: Solve the equation:
(11x - 5)^2 - (10x - 1)^2 −(3x−20)(7x+10)=124

Respuesta :

1)   2x=5x+18

   3x=−18

     x=−6

2)   (a + b) + (b + c) + (a + c) = 29 + 45 + 44

    a + b + b + c + a + c = 118

    2a + 2b + 2c = 118

     2(a + b + c) = 118

       a + b + c = 59

3)  x = -5

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