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Andreeadeea123
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7x-35+63-5x+4=9×+18-21x

Răspuns :

7x-35+63-5x+4=9×+18-21x
7x+28-5x+4=9x+18-21x
7x-5x+32=9x+18-21x
2x+32=9x+18-21x
2x+32=-12x+18
2x+32+12x=18
14x+32=18
14x=18-32
14x=-4
x=-14:14
x=-1

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