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It is equivalent to x + y + 4.
3x+5y+8x+2y combine 3x and 8x to get 11x 11x+5y+2y combine 5y and 2y 11x+7y is the answer.
3x + 2y = 7
-5(x + 2y) -3x + 8y + 5 = -5x -10y -3x + 8y + 5 = -8x -2y + 5
3x+2y = 1 2y = -3x+1 y = -1.5x+0.5