Work Step by Step
The order of operations states that first we perform operations inside grouping symbols, such as parentheses, brackets, and fraction bars. Then, we simplify powers. Then, we multiply and divide from left to right. Finally, we add and subtract from left to right. When we put parentheses around the $4+5$, it makes us add these terms first. This leaves us with $3\times9-6+7$ After that, we would first multiply: $27-6+7$ When we add and subtract these terms from left to right, we are left with $28$, making the equation true.