Applicare la formula: $x+a=b$$\to x=b-a$, dove $a=4$, $b=4+3\sin\left(x\right)$, $x+a=b=4-5\cos\left(m\right)=4+3\sin\left(x\right)$, $x=-5\cos\left(m\right)$ e $x+a=4-5\cos\left(m\right)$

Applicare la formula: $a+b$$=a+b$, dove $a=4$, $b=-4$ e $a+b=4+3\sin\left(x\right)-4$

Applicare la formula: $ax=b$$\to x=\frac{b}{a}$, dove $a=-5$, $b=3\sin\left(x\right)$ e $x=\cos\left(m\right)$

Applicare la formula: $a=b$$\to inverse\left(a,a\right)=inverse\left(a,b\right)$, dove $a=\cos\left(m\right)$ e $b=\frac{3\sin\left(x\right)}{-5}$

Applicare la formula: $\arccos\left(\cos\left(\theta \right)\right)$$=\theta $, dove $x=m$