7+2x=8-15-5x; 2x+5x=8-15-7; 7x= -14; x=(-14)/7= -2. Ответ: x= -2.
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7+2x=8-15-5x; 2x+5x=8-15-7; 7x= -14; x=(-14)/7= -2. Ответ: x= -2.
7+2x=8-15-5x
2x+5x=8-15-7
7x=-14 | : 7
x=-2