15a
Explanation:
a-(-a)+4a-(-a)+7a-(-a)
a+a+4a+a+7a+a=15a
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Verified answer
15a
Explanation:
a-(-a)+4a-(-a)+7a-(-a)
a+a+4a+a+7a+a=15a
Explanation:
[ a - ( - a ) ] + [ 4a - ( - a ) ] + [ 7a - ( - a ) ]
[ a + a ] + [ 4a + a ] + [ 7a + a ]
2a+ 5a +8a
7a + 8a
15a