Решите уравнение a)-8 x +15=-4x+16 б)5/6x+7=5/9x-5

Question

Решите уравнение a)-8 x +15=-4x+16 б)5/6x+7=5/9x-5

Answer 1

A) -8x +15 = -4x +16
-8x +4x =16 -15
-4x =1
x = -1/4
x = -0.25

b) 5(9x-5) =5(6x+7)
45x -25 =30x +35
45x -30x =35 +25
15x =60
x =4

Comments

-8x +15 = -4x +60; -8x+4x=60-15; -4x =45; x= -45/4; x= -11.25

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2)) (5+6x*7)/6x =(5-9x*5)/9x

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9x*(5+42x) =(5-45x)*6x

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45x +378x² =30x -270x²

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45x +378x² -30x +270x² =0

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15x +648x² =0

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x(15 +648x) =0, x1 =0

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15 +648x =0, 648x = -15, x = -15/648. x =-5/216

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спасибо

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пожалуйста