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Simplify or state "cannot be simplified" if the expression cannot be simplified.

a. [tex]\(7ab - 5ac\)[/tex]

b. [tex]\(-2 \cdot 7p + 3 \cdot 2p\)[/tex]

c. [tex]\(5a - 3b - 4a + b\)[/tex]

d. [tex]\(-2x \cdot 4y - 2y \cdot (-3x)\)[/tex]

e. [tex]\(3x \cdot (-2y) - 7 \cdot (-2x)\)[/tex]

f. [tex]\(c - a - b + c - 1 + a + 2\)[/tex]

g. [tex]\(-2 - x - y + 2 + x - y\)[/tex]