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(7x-3y) + (2x+5y) = 9x+2y
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It is 9x + 2y.
The sum of 3 plus 4 is 7.
SUM means plus 4+7=11
The sum of 10 plus 8 is 18.
the sum for 20 + 40 + 70 + 80 = 210
The sum is 4.3