Step by step solution to "To solve: x + 3.9=4.2"

remolatg

Answered question

2021-02-12

To solve:

x + 3.9 = 4.2

Aamina Herring

Skilled2021-02-13Added 85 answers

Calculation: $x + 3.9 = 4.2$

Substract 3.9 on both sides, $x + 3.9 - 3.9 = 4.2 - 3.9$
$3.9 - 3.9$

Based on the definition, $\frac{\begin{array}{r} + 3.9 \\ - 3.9 \end{array}}{+ 0.0}$
$3.9 - 3.9 = 0$
$4.2 - 3.9$

Based on the definition,

$\frac{\begin{array}{r} + 4.2 \\ - 3.9 \end{array}}{+ 0.3}$
$4.2 - 3.9 = 0.3$

Substitute $3.9 - 3.9 = 0 and 4.2 - 3.9 = 0.3 in x + 3.9 - 3.9 = 4.2 - 3.9$
$x + 0 = 0.3$
$x = 0.3$

Final solution: $x = 0.3$

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