Respuesta:
x = -17/7
x = 13/72
x = 17/36
Explicación paso a paso:
x = ( 4 - 3(7))/7
x = ( 4 - 21)/7
x = -17/7 -> -2,428
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4/9 + x = 5/8
4/9(8/8) + x(72/72) = 5/8(9/9)
(32/72) + (72x/72) = (45/72)
32 + 72x = 45
72x = 45 - 32
72x = 13
x = 13/72 -> 0.1805
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3x = 2/3 + 3/4
3x(12/12) = 2/3(4/4) + 3/4(3/3)
(36x/12) = (8/12) + (9/12)
36x = 8 + 9
36x = 17
x = 17/36 -> 0,4722.
