100=A*10+5*20+2*30

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Solution for 100=A*10+5*20+2*30 equation:


Simplifying
100 = A * 10 + 5 * 20 + 2 * 30

Reorder the terms for easier multiplication:
100 = 10A + 5 * 20 + 2 * 30

Multiply 5 * 20
100 = 10A + 100 + 2 * 30

Multiply 2 * 30
100 = 10A + 100 + 60

Reorder the terms:
100 = 100 + 60 + 10A

Combine like terms: 100 + 60 = 160
100 = 160 + 10A

Solving
100 = 160 + 10A

Solving for variable 'A'.

Move all terms containing A to the left, all other terms to the right.

Add '-10A' to each side of the equation.
100 + -10A = 160 + 10A + -10A

Combine like terms: 10A + -10A = 0
100 + -10A = 160 + 0
100 + -10A = 160

Add '-100' to each side of the equation.
100 + -100 + -10A = 160 + -100

Combine like terms: 100 + -100 = 0
0 + -10A = 160 + -100
-10A = 160 + -100

Combine like terms: 160 + -100 = 60
-10A = 60

Divide each side by '-10'.
A = -6

Simplifying
A = -6

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