What is federalism . define it
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Federalism is a mixed or compound mode of government that combines a general government with regional governments in a single political system, dividing the powers between the two. It has its roots in ancient Europe. 

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Federal system (Fedaralism) is a dwmocratic and inclusive ruling system in which power is divided to various autonomous provinces and local units.

Explanation:

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if triangle abc is congruent to triangle def, their interior angles are congruent, because congruent parts of congruent triangles are congruent (cpctc).

that means ∠d is congruent to ∠a; ∠d is equal to 8x - 2.

interior angles of all triangles add to equal 180 degrees, so you can set the sum of these interior angle values equal to 180 and solve for x.

180 = (8x - 2) + 22 + 72

180 = 8x - 2 + 22 + 72

180 = 8x + 92

88 = 8x

11 = x

x = 11