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x = 4
5x + 4 = 10x - 5 10x - 5x = 4 + 5 5x = 9 x = 1.8
-10x+3 = -x+12 -10x+x = 12-3 -9x = 9 x = -1
Substitute the values of x and y in 10x + 7y, thus: 10x + 7y = 10*9 + 7*6 = 90 + 42 = 132