4.2(0.3+x)=8.7

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Solution for 4.2(0.3+x)=8.7 equation: 


Simplifying
4.2(0.3 + x) = 8.7
(0.3 * 4.2 + x * 4.2) = 8.7
(1.26 + 4.2x) = 8.7

Solving
1.26 + 4.2x = 8.7

Solving for variable 'x'.

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

Add '-1.26' to each side of the equation.
1.26 + -1.26 + 4.2x = 8.7 + -1.26

Combine like terms: 1.26 + -1.26 = 0.00
0.00 + 4.2x = 8.7 + -1.26
4.2x = 8.7 + -1.26

Combine like terms: 8.7 + -1.26 = 7.44
4.2x = 7.44

Divide each side by '4.2'.
x = 1.771428571

Simplifying
x = 1.771428571

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