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Find the sum of the expressions 8x+10x-12 and 13x-7x+5, then subtract it to the expressions 35x-9x-8

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Light801id
(8x+10x-12+13x-7x+5 )-35x-9x-8
=(18x-12+5x+5)-35x-9x-8
=(18x+5x-12+5)-35x-9x-8
=23x-7-35x-9x-8
=23x-35x-9x-7-8
= -21x-15
(to make it positive, multiply by negative sign)
= -(-21x-15)
=21x+15 is the answer