3x×7=2x−43x\times 7=2x-4
1
Simplify  3x×73x\times 7  to  21x21x.
21x=2x−421x=2x-4

2
Subtract 2x2x from both sides.
21x−2x=−421x-2x=-4

3
Simplify  21x−2x21x-2x  to  19x19x.
19x=−419x=-4

4
Divide both sides by 1919.
x=−419x=-\frac{4}{19}

Done

Decimal Form: -0.210526

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