помогите пожалуйста, заранее благодарю.
упростите выражение:
2(3a+4)+3(a-7)-7(2a-7)
3(2x-1)-5(x-3)+6(3x-4)
3(1/2x-1 1/2)+2(1/4x+1/2)
5/4(1/5x-1/5)-4/5(1/4x-3/4)
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