(4x-5y+6x)-(x-2y-3z)
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Step-by-step explanation:
whe when brackets open the sign changes
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Step-by-step explanation:
=(4x-8xy-12xz) (5xy-10y-15yz) (6x-12xy-18xz)
=(4x+6x) (-8xy+5xy-12xy) (-12xz-18xz)-10y-15yz
=10x-15xy-30xz-10y-15yz
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