=.75(4.2)+x

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Solution for =.75(4.2)+x equation: 


Simplifying
0 = 0.75(4.2) + x

Multiply 0.75 * 4.2
0 = 3.15 + x

Solving
0 = 3.15 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
0 + -1x = 3.15 + x + -1x
Remove the zero:
-1x = 3.15 + x + -1x

Combine like terms: x + -1x = 0
-1x = 3.15 + 0
-1x = 3.15

Divide each side by '-1'.
x = -3.15

Simplifying
x = -3.15

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