10(7.7)=10(8.9-0.4x)

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Solution for 10(7.7)=10(8.9-0.4x) equation:


Simplifying
10(7.7) = 10(8.9 + -0.4x)

Multiply 10 * 7.7
77 = 10(8.9 + -0.4x)
77 = (8.9 * 10 + -0.4x * 10)
77 = (89 + -4x)

Solving
77 = 89 + -4x

Solving for variable 'x'.

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

Add '4x' to each side of the equation.
77 + 4x = 89 + -4x + 4x

Combine like terms: -4x + 4x = 0
77 + 4x = 89 + 0
77 + 4x = 89

Add '-77' to each side of the equation.
77 + -77 + 4x = 89 + -77

Combine like terms: 77 + -77 = 0
0 + 4x = 89 + -77
4x = 89 + -77

Combine like terms: 89 + -77 = 12
4x = 12

Divide each side by '4'.
x = 3

Simplifying
x = 3

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