Question

lembre-se de que -3x/7 significa -3 . x ÷ 7 A 3 X/7 = 6 B 3X - 15/2=8 C 8X + 5/3=-1 D 2X + 5/4=2

Answer 1

A 3x = 6 ==> 3x = 42 ==> x =14
     7
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B 3x - 15 = 8 ==> 6x - 15 = 16 ==> 6x = 16+15 ==> 6x=31 ==> x = 31/5 
            2
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C 8X + 5 = - 1 ==> 24x + 5 = - 3 ==> 24x = - 3 - 5 => 24x = - 8 => x = -8/24 
            3
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D 2X + 5 = 2 ==> 8x+5=8==> 8x= 8-5==> 8x=3 ==> x = 3/8
            4