-15
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-7 + 2(x-3) = -7+2x-6 = 2x - 13
X= -2
13+-12--5 = 6
15 + 10 - 13 - 5 = 7
2√50 + 13√200= 2√[(25)(2)] + 13√[(100)(2)]= 2(√52)(√2) + 13(√102)(√2)= 2(5)√2 + 13(10)√2= 10√2 + 130√2= (10 + 130)√2= 140√2