3. solve: -35 + 7x = 7(1 + 4x)

Explanation:

Step1: Expand the right - hand side

$-35 + 7x=7\times1+7\times4x$ $-35 + 7x = 7+28x$

Step2: Move the terms with $x$ to one side

$7x-28x=7 + 35$

Step3: Combine like terms

$-21x=42$

Step4: Solve for $x$

$x=\frac{42}{-21}$ $x=-2$

Answer:

$x = - 2$