Question

a)4 . x - 15=-75 - x

b)72 - 3 . x=5 . x + 8

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Answer 1

a) 4.x - 15 = -75 - x

=> 4x + x = -75 + 15

=> 5x = -60

=> x = -60/5 = -12

b) 72 - 3.x = 5.x + 8

=> -3x - 5x = 8 - 72

=> -8x = -64

=> x = -64/-8 = 8

Answer 2

                                                           Bài giải

a, \(4\cdot x-15=-75-x\)

\(4x+x=-75+15\)

\(5x=-60\)

\(x=-60\text{ : }5\)

\(x=-12\)

b, \(72-3\cdot x=5\cdot x+8\)

\(5x+3x=72-8\)

\(8x=64\)

\(x=64\text{ : }8\)

\(x=8\)

Answer 3

a, \(4\cdot x-15=-75-x\)

\(4x+x=-75+15\)

\(5x=-60\)

\(x=-60\text{ : }5\)

\(x=-12\)

b, \(72-3\cdot x=5\cdot x+8\)

\(5x+3x=72-8\)

\(8x=64\)

\(x=64\text{ : }8\)

\(x=8\)