2x-3y-7y+4x-5=6x-10y-5=6*10-10*4-5=60-40-5=60-45=15
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Assume that the expression 4x5 in the question is 4x5.4x5 = 3 : x5 = 3/4 : x = 5√(3/4) : then 2k.5√(3/4) + 10 = 2 : 2k.5√(3/4) = 2 - 10 = -8 :k = -4 ÷ 5√(3/4) = -4 ÷ 0.9441 = -4.2369 (4dp)
-4 plus 10 equals 6.
x=10
12 + 10 + 11 equals 33
A equals 4 because 4 plus 6 is 10 or 10 minus 6 is 4.