Explications étape par étape:
a) 3x + 56 - 7x + 13 = 60 + x
56+13-60 = x+7x-3x
9 = 5x x = 9/5
b) A= 121x²-49-33x²+44x-21x+28=
88x² + 23x - 21
c) (5/7)x -11 = 17
(5/7)x = 17+11 = 28
x = 28× 7/5 = 196/5
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Explications étape par étape:
a) 3x + 56 - 7x + 13 = 60 + x
56+13-60 = x+7x-3x
9 = 5x x = 9/5
b) A= 121x²-49-33x²+44x-21x+28=
88x² + 23x - 21
c) (5/7)x -11 = 17
(5/7)x = 17+11 = 28
x = 28× 7/5 = 196/5