Question

Resuelve las siguientes ecuaciones a)x+3=7 b)7x+4=10-3x c)2x+3=-x d)45-x=4x+25

Answer 1

x + 3 = 7

x = 7 - 3

x = 4
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7x + 4 = 10 - 3x

7x + 3x = 10 - 4

10x = 6

x = 6/10---simplificamos la mitad

x = 3/5
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2x + 3 = - x

2x + x = - 3

3x = - 3

x = -3/3

x = - 1 
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45 - x = 4x + 25

- x - 4x = 25 - 45

- 6x = - 20

x = -20/-5

x = 4