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A two-step equation is undone in reverse order: first subtract the constant from both sides, then divide by the coefficient. So x = (c − b)/a.
Two-step solution
ax + b = c ⇒ x = (c − b) / a
Subtract 7 to get 3x = 15, then divide by 3 to get x = 5.
The addition was applied last when building the expression, so it must be undone first — inverse operations in reverse order.