Explicación paso a paso:
a)
[tex]2x + 3x + 56 = 12x \\ 5x + 56 = 12x \\ 56 = 7x \\ 8 = x[/tex]
b)
[tex]3x - 4x - 12 - 34 = 0 \\ - x - 46 = 0 \\ x = - 46[/tex]
c)
[tex] \frac{(2x - 1)}{(6x - 4)} = \frac{(7x - 4)}{(5x - 9)} \\ (2x - 1)(5x - 9) = (7x - 4)(6x - 4) \\ 10 {x}^{2} - 18x - 5x + 9 = 42 {x}^{2} - 28x - 24x + 16 \\ - 32 {x}^{2} - 23x + 9 = - 52x + 16 \\ - 32 {x}^{2} + 29x - 7 = 0[/tex]
d)
[tex]34x - 23x - 45x - 67x + 12 - 3 = 0 \\ - 101x + 9 = 0 \\ - 101x = - 9 \\ x = \frac{9}{101} [/tex]
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Explicación paso a paso:
a)
[tex]2x + 3x + 56 = 12x \\ 5x + 56 = 12x \\ 56 = 7x \\ 8 = x[/tex]
b)
[tex]3x - 4x - 12 - 34 = 0 \\ - x - 46 = 0 \\ x = - 46[/tex]
c)
[tex] \frac{(2x - 1)}{(6x - 4)} = \frac{(7x - 4)}{(5x - 9)} \\ (2x - 1)(5x - 9) = (7x - 4)(6x - 4) \\ 10 {x}^{2} - 18x - 5x + 9 = 42 {x}^{2} - 28x - 24x + 16 \\ - 32 {x}^{2} - 23x + 9 = - 52x + 16 \\ - 32 {x}^{2} + 29x - 7 = 0[/tex]
d)
[tex]34x - 23x - 45x - 67x + 12 - 3 = 0 \\ - 101x + 9 = 0 \\ - 101x = - 9 \\ x = \frac{9}{101} [/tex]