7x+4y - 5x+2x+3y+y, 10w+2z - 3w+7w+4z-2z, 4p+5q - 3p+q+p+4q, 3a+b - 4a+3b-a-2b, 6c-2d - c+2d+5c-4d, 2m-3n - 3m-7n-m+4n, 4e-7f - 5e-3f-e-4f, x+13y - 2x+8y-3x+2x+5y, -2p+3q - 3p-q-5p+4q, -4a-5b - a-2b-5a-3b,

Simplifying expressions (Adding/Subtracting two terms)

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